Protesters gather near a burning barrier during a demonstration against the G20 summit on Friday, July 7, in Hamburg, Germany. Protesters clashed with authorities as world leaders gathered for the two-day economic summit.
Protesters gather near a burning barrier during a demonstration against the G20 summit on Friday, July 7, in Hamburg, Germany. Protesters clashed with authorities as world leaders gathered for the two-day economic summit.
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Protesters are visible through a hole in a destroyed window of a supermarket in Hamburg's Schanzenviertel district on July 7.
Protesters are visible through a hole in a destroyed window of a supermarket in Hamburg's Schanzenviertel district on July 7.
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A fire rages during demonstrations against the G20 summit July 7 in Hamburg.
A fire rages during demonstrations against the G20 summit July 7 in Hamburg.
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Police stand guard in the street while protesters erect barricades July 7 in Hamburg.
Police stand guard in the street while protesters erect barricades July 7 in Hamburg.
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Riot police head down a road during the "Welcome to Hell" protest march on Thursday, July 6.
Riot police head down a road during the "Welcome to Hell" protest march on Thursday, July 6.
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Protesters erect burning barricades in front of the Rote Flora, a left-wing cultural center, on July 6 in Hamburg.
Protesters erect burning barricades in front of the Rote Flora, a left-wing cultural center, on July 6 in Hamburg.
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An officer looks on as barricades burn in front of the Rote Flora center.
An officer looks on as barricades burn in front of the Rote Flora center.
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Police stand in front of the Rote Flora left-wing center as debris smolders in the street.
Police stand in front of the Rote Flora left-wing center as debris smolders in the street.
Thomas Lohnes/Getty Images
A demonstrator is sprayed by water canons.
A demonstrator is sprayed by water canons.
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Police and protesters clash during the Welcome to Hell march.
Police and protesters clash during the Welcome to Hell march.
Kara Fox/CNN
A man wearing protective goggles moves away from officers trying to clear the streets using water cannons.
A man wearing protective goggles moves away from officers trying to clear the streets using water cannons.
Kara Fox/CNN
Police gather at Hamburg harbor before the anti-G20 protest march.
Police gather at Hamburg harbor before the anti-G20 protest march.
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Riot police use a water cannon on demonstrators.
Riot police use a water cannon on demonstrators.
CHRISTOF STACHE/AFP/Getty Images
Protesters march during the rally.
Protesters march during the rally.
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Protesters clash with riot police. The protest escalated throughout the day and evening.
Protesters clash with riot police. The protest escalated throughout the day and evening.
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Police attempt to clear the street while using water cannons and pepper spray on demonstrators.
Police attempt to clear the street while using water cannons and pepper spray on demonstrators.
Thomas Lohnes/Getty Images
A woman wearing a sign depicting the G20 summit world leaders blows bubbles at Hamburg harbor before the protest march.
A woman wearing a sign depicting the G20 summit world leaders blows bubbles at Hamburg harbor before the protest march.
Thomas Lohnes/Getty Images
Participants in the protest. Police said one person had been arrested by late Thursday night.
Participants in the protest. Police said one person had been arrested by late Thursday night.
Alex Panzicov/Sputnik/AP
A banner on a bridge reads "President Macri, Don't sell our Argentina." Officials said at least 76 police officers were hurt.
A banner on a bridge reads "President Macri, Don't sell our Argentina." Officials said at least 76 police officers were hurt.
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Officials said the originally peaceful protest became violent, with firecrackers and bottles being thrown at riot police.
Officials said the originally peaceful protest became violent, with firecrackers and bottles being thrown at riot police.
Michael Probst/AP