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HAMBURG, GERMANY - JULY 06: Riot police walk down a road during 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 Leon Neal/Getty Images)

HAMBURG, GERMANY - JULY 06:  Riot police walk down a road during 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 Leon Neal/Getty Images)