- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315082527-new-zealand-mosque-analysis.jpg?q=x_0,y_0,h_1080,w_1919,c_fill/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315082527-new-zealand-mosque-analysis.jpg?q=x_0,y_0,h_1080,w_1919,c_fill/h_540,w_960" } }" data-vr-video="false" data-show-html=" New Day " data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T12:39:30Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/levi-west-social-media-new-zealand-mosque-shooting-newday-vpx.cnn" data-branding-key="" data-video-slug="Levi West social media New Zealand mosque shooting newday vpx" data-first-publish-slug="Levi West social media New Zealand mosque shooting newday vpx" data-video-tags="international relations and national security,national security,terrorism,terrorism and counter-terrorism,unrest, conflicts and war" data-details="">
New Zealand mosque analysis
Expert: Catching videos on social media harder than you think
01:09 - Source: CNN
New Zealand Mosque Shootings 15 videos
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315082527-new-zealand-mosque-analysis.jpg?q=x_0,y_0,h_1080,w_1919,c_fill/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315082527-new-zealand-mosque-analysis.jpg?q=x_0,y_0,h_1080,w_1919,c_fill/h_540,w_960" } }" data-vr-video="false" data-show-html=" New Day " data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T12:39:30Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/levi-west-social-media-new-zealand-mosque-shooting-newday-vpx.cnn" data-branding-key="" data-video-slug="Levi West social media New Zealand mosque shooting newday vpx" data-first-publish-slug="Levi West social media New Zealand mosque shooting newday vpx" data-video-tags="international relations and national security,national security,terrorism,terrorism and counter-terrorism,unrest, conflicts and war" data-details="">
New Zealand mosque analysis
Expert: Catching videos on social media harder than you think
01:09
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315032131-16-christchurch-shooting-0315.jpg?q=x_0,y_0,h_1687,w_2997,c_fill/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315032131-16-christchurch-shooting-0315.jpg?q=x_0,y_0,h_1687,w_2997,c_fill/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T11:02:12Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/new-zealand-mosque-shooting-sc-lon-orig.cnn" data-branding-key="" data-video-slug="new zealand mosque shooting sc lon orig" data-first-publish-slug="new zealand mosque shooting sc lon orig" data-video-tags="2019 new zealand mosque shootings,buildings and structures,christchurch,continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,death and dying,deaths and fatalities,homicide,mass murder,mosques,murder,new zealand,oceania,points of interest,religious buildings,shootings,society,international relations and national security,national security,terrorism,terrorism and counter-terrorism,terrorist attacks,unrest, conflicts and war" data-details="">
Police stand outside a mosque in Linwood, Christchurch, New Zealand, Friday, March 15, 2019. Multiple people were killed during shootings at two mosques full of people attending Friday prayers. (AP Photo/Mark Baker)
Scenes from one of New Zealand's 'darkest days'
02:26
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/170817131205-australia-pauline-hanson.jpg?q=x_2,y_0,h_1078,w_1915,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/170817131205-australia-pauline-hanson.jpg?q=x_2,y_0,h_1078,w_1915,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-16T20:43:26Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/16/politicians-hate-speech-worldwide-orig.cnn" data-branding-key="" data-video-slug="politicians hate speech worldwide orig" data-first-publish-slug="politicians hate speech worldwide orig" data-video-tags="anti-semitism,belief, religion and spirituality,demographic groups,discrimination,misc people,muslim people,politics,population and demographics,racism and racial discrimination,religious discrimination,sara sidner,societal issues,society,government and public administration" data-details="">
australia pauline hanson
Some far-right politicians encourage hateful language
02:44
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190318163911-new-zealand-haka-students.jpg?q=x_2,y_114,h_1231,w_2188,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190318163911-new-zealand-haka-students.jpg?q=x_2,y_114,h_1231,w_2188,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-18T16:50:41Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/18/new-zealand-tribute-for-christchurch-victims-sc-lon-orig.cnn" data-branding-key="" data-video-slug="new zealand tribute for christchurch victims sc lon orig" data-first-publish-slug="new zealand tribute for christchurch victims sc lon orig" data-video-tags="christchurch,continents and regions,new zealand,oceania,2019 new zealand mosque shootings,buildings and structures,crime, law enforcement and corrections,crimes against persons,criminal offenses,homicide,international relations and national security,mass murder,mosques,murder,national security,points of interest,religious buildings,shootings,terrorism,terrorism and counter-terrorism,terrorist attacks,unrest, conflicts and war,wellington" data-details="">
CHRISTCHURCH, NEW ZEALAND - MARCH 18: Youngsters perform a Haka during a students vigil near Al Noor mosque on March 18, 2019 in Christchurch, New Zealand. 50 people were killed, and dozens are still injured in hospital after a gunman opened fire on two Christchurch mosques on Friday, 15 March. The accused attacker, 28-year-old Australian, Brenton Tarrant, has been charged with murder and remanded in custody until April 5. The attack is the worst mass shooting in New Zealand's history. (Photo by Carl Court/Getty Images)
New Zealanders pay tribute to Christchurch victims
02:43
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190316192611-abdul-aziz-wahabzadah.jpg?q=x_2,y_0,h_1078,w_1915,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190316192611-abdul-aziz-wahabzadah.jpg?q=x_2,y_0,h_1078,w_1915,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-16T23:32:43Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/16/abdul-aziz-wahabzadah-new-zealand-sot-vpx.cnn" data-branding-key="" data-video-slug="abdul aziz wahabzadah new zealand sot vpx" data-first-publish-slug="abdul aziz wahabzadah new zealand sot vpx" data-video-tags="continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,new zealand,oceania,shootings,2019 new zealand mosque shootings,christchurch,homicide,international relations and national security,mass murder,murder,national security,terrorism,terrorism and counter-terrorism,terrorist attacks,unrest, conflicts and war" data-details="">
abdul aziz wahabzadah
Man describes confronting New Zealand shooting suspect
01:42
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190316163041-01-christchurch-flowers.jpg?q=x_2,y_150,h_898,w_1596,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190316163041-01-christchurch-flowers.jpg?q=x_2,y_150,h_898,w_1596,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-16T20:53:29Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/16/death-toll-new-zealand-mosque-attacks-police-commissioner-sot-vpx.cnn" data-branding-key="" data-video-slug="death toll new zealand mosque attacks police commissioner sot vpx" data-first-publish-slug="death toll new zealand mosque attacks police commissioner sot vpx" data-video-tags="2019 new zealand mosque shootings,buildings and structures,christchurch,continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,death and dying,deaths and fatalities,homicide,international relations and national security,law enforcement,mass murder,mosques,murder,national security,new zealand,oceania,points of interest,policing and police forces,religious buildings,shootings,society,terrorism,terrorism and counter-terrorism,terrorist attacks,unrest, conflicts and war" data-details="">
Tributes laid at the police line close to the Al Noor mosque in Christchurch where 41 people died.
Terror attack death toll rises to 50
01:51
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190316125837-new-zealand-attack-survivor.jpg?q=x_398,y_246,h_619,w_1100,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190316125837-new-zealand-attack-survivor.jpg?q=x_398,y_246,h_619,w_1100,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html=" Newsroom " data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-16T17:19:12Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/16/wasseim-alsati-new-zealand-attack-survivor-nr-vpx.cnn" data-branding-key="" data-video-slug="wasseim alsati new zealand attack survivor nr vpx" data-first-publish-slug="wasseim alsati new zealand attack survivor nr vpx" data-video-tags="continents and regions,new zealand,oceania,2019 new zealand mosque shootings,christchurch,crime, law enforcement and corrections,crimes against persons,criminal offenses,homicide,international relations and national security,mass murder,murder,national security,shootings,terrorism,terrorism and counter-terrorism,terrorist attacks,unrest, conflicts and war,buildings and structures,mosques,points of interest,religious buildings" data-details="">
new zealand attack survivor
New Zealand attack survivor shares message from hospital
00:55
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315120428-30-christchurch-shooting-0315.jpg?q=x_45,y_109,h_2305,w_4096,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315120428-30-christchurch-shooting-0315.jpg?q=x_45,y_109,h_2305,w_4096,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html=" Newsroom " data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T15:40:38Z" data-video-section="business" data-canonical-url="https://www.cnn.com/videos/business/2019/03/15/new-zealand-mosque-shooting-video-social-media-cristina-alesci-sot-nr-vpx.cnn" data-branding-key="" data-video-slug="new zealand mosque shooting video social media cristina alesci sot nr vpx" data-first-publish-slug="new zealand mosque shooting video social media cristina alesci sot nr vpx" data-video-tags="2019 new zealand mosque shootings,belief, religion and spirituality,buildings and structures,christchurch,christianity,churches and cathedrals,continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,homicide,international relations and national security,internet and www,mass murder,murder,national security,new zealand,oceania,points of interest,religious buildings,religious groups,shootings,social media,society,technology,terrorism,terrorism and counter-terrorism,terrorist attacks,unrest, conflicts and war" data-details="">
A police officer secures the area in front of the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP) (Photo credit should read TESSA BURROWS/AFP/Getty Images)
Online platforms scramble to remove terror attack videos
03:18
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315135930-terror-attack-reactions-12.jpg?q=x_0,y_127,h_1371,w_2437,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315135930-terror-attack-reactions-12.jpg?q=x_0,y_127,h_1371,w_2437,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html=" The Lead " data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T21:50:44Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/new-zealand-attack-suspect-manifesto-griffin-pkg-lead-vpx.cnn" data-branding-key="" data-video-slug="new zealand attack suspect manifesto griffin pkg lead vpx" data-first-publish-slug="new zealand attack suspect manifesto griffin pkg lead vpx" data-video-tags="continents and regions,discrimination,drew griffin,misc people,new zealand,oceania,racism and racial discrimination,societal issues,society" data-details="">
In the wake of the deadly attack against two mosques in New Zealand, police officers sit in their vehicle out side the Al Aqsa Islamic Society mosque in Philadelphia, ahead of prayers Friday, March 15, 2019. (AP Photo/Matt Rourke)
Suspect's manifesto part of a disturbing pattern
02:20
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315075836-rosemary-omar-worried-mom-son-missing.jpg?q=x_315,y_123,h_706,w_1255,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315075836-rosemary-omar-worried-mom-son-missing.jpg?q=x_315,y_123,h_706,w_1255,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T12:43:14Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/new-zealand-mosque-shooting-rosemary-omar-son-missing-coren-sot-vpx.cnn" data-branding-key="" data-video-slug="new zealand mosque shooting rosemary omar son missing coren sot vpx" data-first-publish-slug="new zealand mosque shooting rosemary omar son missing coren sot vpx" data-video-tags="2019 new zealand mosque shootings,buildings and structures,christchurch,continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,homicide,mass murder,mosques,murder,new zealand,oceania,points of interest,religious buildings,shootings" data-details="">
Rosemary Omar worried mom son missing
New Zealand mom worries: Waiting to see if son is all right
01:57
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315031007-new-zealand-pm-jacinda-ardern.jpg?q=x_2,y_0,h_1078,w_1915,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315031007-new-zealand-pm-jacinda-ardern.jpg?q=x_2,y_0,h_1078,w_1915,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T07:11:31Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/new-zealand-prime-minister-jacinda-ardern-mosque-attacks-sot-vpx.cnn" data-branding-key="" data-video-slug="new zealand prime minister jacinda ardern mosque attacks sot vpx" data-first-publish-slug="new zealand prime minister jacinda ardern mosque attacks sot vpx" data-video-tags="2019 new zealand mosque shootings,buildings and structures,christchurch,continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,death and dying,deaths and fatalities,diseases and disorders,health and medical,homicide,international relations and national security,jacinda ardern,mass murder,mosques,murder,national security,new zealand,oceania,points of interest,political figures - intl,religious buildings,shootings,society,terrorism,terrorism and counter-terrorism,terrorist attacks,unrest, conflicts and war,wounds and injuries" data-details="">
new zealand pm jacinda ardern
New Zealand Prime Minister: This was a terrorist attack
02:19
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315014606-new-zealand-mosque-shooting-survivor.jpg?q=x_2,y_0,h_1078,w_1915,c_crop/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315014606-new-zealand-mosque-shooting-survivor.jpg?q=x_2,y_0,h_1078,w_1915,c_crop/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T05:49:30Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/new-zealand-mosque-shootings-survivor-sot-vpx.cnn" data-branding-key="" data-video-slug="New Zealand mosque shootings survivor sot vpx" data-first-publish-slug="New Zealand mosque shootings survivor sot vpx" data-video-tags="2019 new zealand mosque shootings,buildings and structures,christchurch,continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,firearms,homicide,mass murder,mosques,murder,new zealand,oceania,points of interest,religious buildings,shootings,weapons and arms" data-details="">
New Zealand mosque shooting survivor
Survivor: I prayed the shooter would run out of bullets
00:41
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315005248-new-zealand-police-commissioner-mike-bush.jpg?q=x_0,y_0,h_1080,w_1919,c_fill/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190315005248-new-zealand-police-commissioner-mike-bush.jpg?q=x_0,y_0,h_1080,w_1919,c_fill/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T05:10:50Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/new-zealand-mosque-shootings-police-commissioner-sot-vpx.cnn" data-branding-key="" data-video-slug="New Zealand mosque shootings police commissioner sot vpx" data-first-publish-slug="New Zealand mosque shootings police commissioner sot vpx" data-video-tags="2019 new zealand mosque shootings,bombs and explosive devices,buildings and structures,christchurch,continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,homicide,improvised explosive devices,law enforcement,mass murder,mosques,murder,new zealand,oceania,points of interest,policing and police forces,religious buildings,shootings,weapons and arms" data-details="">
New Zealand Police Commissioner Mike Bush
Police commissioner: Vehicles we stopped had IEDs
01:28
Now playing
- Source: CNN
- Source: CNN " data-fave-thumbnails="{"big": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190314231746-jacinda-ardern-shooting-press-conference.jpg?q=x_0,y_0,h_1080,w_1919,c_fill/h_540,w_960" }, "small": { "uri": "https://media.cnn.com/api/v1/images/stellar/prod/190314231746-jacinda-ardern-shooting-press-conference.jpg?q=x_0,y_0,h_1080,w_1919,c_fill/h_540,w_960" } }" data-vr-video="false" data-show-html="" data-byline-html="
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Updated 10:38 AM EDT, Fri March 15, 2019
" data-check-event-based-preview="" data-is-vertical-video-embed="false" data-network-id="" data-publish-date="2019-03-15T03:47:03Z" data-video-section="world" data-canonical-url="https://www.cnn.com/videos/world/2019/03/15/christchurch-shooting-jacinda-ardern-press-conference-sot-vpx.cnn" data-branding-key="" data-video-slug="christchurch shooting jacinda ardern press conference sot vpx" data-first-publish-slug="christchurch shooting jacinda ardern press conference sot vpx" data-video-tags="buildings and structures,christchurch,continents and regions,crime, law enforcement and corrections,crimes against persons,criminal offenses,jacinda ardern,mosques,new zealand,oceania,points of interest,political figures - intl,press conferences,religious buildings,shootings,2019 new zealand mosque shootings" data-details="">
Jacinda Ardern shooting press conference
Prime minister: One of New Zealand's darkest days
02:06
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- Source: CNN
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Updated 10:38 AM EDT, Fri March 15, 2019
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Witness: Shooting lasted for 10-15 minutes
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- Source: CNN
Hong Kong CNN Business  — 

Facebook, YouTube and Twitter are struggling to halt the spread of horrific footage that appears to show a massacre at a mosque in New Zealand as it was taking place.

Dozens of people were killed Friday in shootings at two mosques in the city of Christchurch.

One of the shooters appears to have livestreamed the attack on Facebook (FB). The disturbing video, which has not been verified by CNN, ran for nearly 17 minutes and purportedly shows the gunman walking into a mosque and opening fire.

“New Zealand Police alerted us to a video on Facebook shortly after the livestream commenced and we quickly removed both the shooter’s Facebook and Instagram accounts and the video,” Mia Garlick, Facebook’s director of policy for Australia and New Zealand, said in a statement.

Facebook declined further comment on when exactly it took down the video.

Police responding to one of two shootings at mosques in Christchurch, New Zealand. One of the shooters appears to have livestreamed footage of the deadly attack.
Police responding to one of two shootings at mosques in Christchurch, New Zealand. One of the shooters appears to have livestreamed footage of the deadly attack.
Mark Baker/AP

What we know

Hours after the attack, however, copies of the gruesome video continued to appear on Facebook, YouTube and Twitter, raising new questions about the companies’ ability to manage harmful content on their platforms.

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Bloodied bandages on the road following a shooting resulting in multiply fatalies and injuries at the Masjid Al Noor on Deans Avenue in Christchurch, New Zealand, Friday 15 March.
Bloodied bandages on the road following a shooting resulting in multiply fatalies and injuries at the Masjid Al Noor on Deans Avenue in Christchurch, New Zealand, Friday 15 March.
Martin Hunter/EPA

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Facebook is “removing any praise or support for the crime and the shooter or shooters as soon as we’re aware,” Garlick said.

Twitter (TWTR) said it suspended an account related to the shooting and is working to remove the video from its platform.

YouTube, which is owned by Google (GOOGL), removes “shocking, violent and graphic content” as soon as it is made aware of it, according to a Google (GOOGL) spokesperson. YouTube also declined to comment on how long it took to first remove the video.

New Zealand police asked social media users to stop sharing the purported shooting footage and said they were seeking to have it taken down.

CNN is choosing not to publish additional information regarding the video until more details are available.

Tech firms ‘don’t see this as a priority’

This is the latest case of social media companies being caught off guard by killers posting videos of their crimes, and other users then sharing the disturbing footage. It has happened in the United States, Thailand, Denmark and other countries.

Friday’s video reignites questions about how social media platforms handle offensive content: Are the companies doing enough to try to catch this type of content? How quickly should they be expected to remove it?

“While Google, YouTube, Facebook and Twitter all say that they’re cooperating and acting in the best interest of citizens to remove this content, they’re actually not because they’re allowing these videos to reappear all the time,” said Lucinda Creighton, a senior adviser at the Counter Extremism Project, an international policy organization.

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Facebook’s artificial intelligence tools and human moderators were apparentlyunable to detect the livestream of the shooting. The company says it was alerted to it by New Zealand police.

“The tech companies basically don’t see this as a priority, they wring their hands, they say this is terrible,” Creighton said. “But what they’re not doing is preventing this from reappearing.”

John Battersby, a counter-terrorism expert at Massey University of New Zealand, said the country had been spared mass terrorist attacks, partly because of its isolation. Social media had changed that.

“This fellow live streamed the shooting and his supporters have cheered him on, and most of them are not in New Zealand,” he said. “Unfortunately once it’s out there and it’s downloaded, it can still be (online),” he added.

The spread of the video could inspire copycats, said CNN legal enforcement analyst Steve Moore, a retired supervisory special agent for the FBI.

“What I would tell the public is this: Do you want to help terrorists? Because if you do, sharing this video is exactly how you do it,” Moore said.

“Do not share the video or you are part of this,” he added.

Hadas Gold, Donie O’Sullivan, Samuel Burke and Paul Murphy contributed to this report.