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.
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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.
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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.
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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.
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A demonstrator is sprayed by water canons.
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Police and protesters clash during the Welcome to Hell march.
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A man wearing protective goggles moves away from officers trying to clear the streets using water cannons.
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Police gather at Hamburg harbor before the anti-G20 protest march.
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Riot police use a water cannon on demonstrators.
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Protesters march during the rally.
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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.
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A woman wearing a sign depicting the G20 summit world leaders blows bubbles at Hamburg harbor before the protest march.
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Participants in the protest. Police said one person had been arrested by late Thursday night.
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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.