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HAMBURG, GERMANY - JULY 06: Protesters erect burning barricades in front of the Rote Flora left-wing centre after the 'Welcome to Hell' protest march on July 6, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts tonight at the 'Welcome to Hell' anti-G20 protest. (Photo by Alexander Koerner/Getty Images)

HAMBURG, GERMANY - JULY 06:  Protesters erect burning barricades in front of the Rote Flora left-wing centre after the 'Welcome to Hell' protest march on July 6, 2017 in Hamburg, Germany.  Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts tonight at the 'Welcome to Hell' anti-G20 protest.  (Photo by Alexander Koerner/Getty Images)