People stand in front of police vehicles 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)





Demonstrators face policemen during a protest on July 7, 2017 in Hamburg, northern Germany, where leaders of the world's top economies gather for a G20 summit.
Protesters clashed with police and torched patrol cars in fresh violence ahead of the G20 summit, police said. German police and protestors had clashed already on Thursday (July 6, 2017) at an anti-G20 march, with police using water cannon and tear gas to clear a hardcore of masked anti-capitalist demonstrators, AFP reporters said. (Photo by Steffi Loos/AFP Photo)





An anti G20 Summit demonstrator runs away from a police water cannon near Hamburg on July 7, 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. (Photo by Thomas Lohnes/Getty Images)





Riot police use water cannon against a protester throwning road signs on July 7, 2017 in Hamburg, northern Germany, where leaders of the world's top economies gather for a G20 summit. Protesters clashed with police and torched patrol cars in fresh violence ahead of the G20 summit, police said. German police and protestors had clashed already the day before at an anti-G20 march, with police using water cannon and tear gas to clear a hardcore of masked anti-capitalist demonstrators, AFP reporters said. (Photo by Odd Andersen/AFP Photo)





A protester is detained by German police officers during the G-20 summit in Hamburg, Germany, 07 July 2017. The G20 Summit (or G-20 or Group of Twenty) is an international forum for governments from 20 major economies. The summit is taking place in Hamburg 07 to 08 July 2017. (Photo by Massimo Percossi/EPA)





A protester holds a wodden plank during the protests at the G20 summit in Hamburg, Germany, July 7, 2017. (Photo by Fabrizio Bensch/Reuters)





Police use water cannons as protesters gather to participate in an anti-G20 march on July 7, 2017 in Hamburg, Germany. Authorities are braced for large-scale and disruptive protests as Leaders of the G20 group of nations arrive in Hamburg for the July 7-8 G20 summit. (Photo by Alexander Koerner/Getty Images)





An anti-G20 Summit protester lies on the ground as riot policemen charge during clashes on July 7, 2017 in Hamburg, Germany. (Photo by Michele Tantussi/Getty Images)





A woman covers her face as a fire burns in the middle of town during an anti-G20 protest on July 7, 2017 in Hamburg, Germany. Authorities are braced for large-scale and disruptive protests as Leaders of the G20 group of nations arrive in Hamburg for the July 7-8 G20 summit. (Photo by Leon Neal/Getty Images)





German riot police confront protesters during the demonstrations at the G20 summit in Hamburg, Germany, July 6, 2017. (Photo by Kai Pfaffenbach/Reuters)





German special police forces walk through the Schanze district following clashes with anti G20-protesters in Hamburg, Germany, July 7, 2017. (Photo by Kai Pfaffenbach/Reuters)





A woman climbs an armored police vehicle on the first day of the G-20 summit in Hamburg, northern Germany, Friday, July 7, 2017. The leaders of the group of 20 meet July 7 and 8. (Photo by Matthias Schrader/AP Photo)





A protester reacts after being pepper-sprayed after climbing on top of German police vehicle during a demonstration at the G20 summit in Hamburg, Germany, July 7, 2017. (Photo by Pawel Kopczynski/Reuters)





A woman is pepper-sprayed by police after she climbed an armored police vehicle on the first day of the G-20 summit in Hamburg, northern Germany, Friday, July 7, 2017. (Photo by Matthias Schrader/AP Photo)





Policemen shoot pepper spray on a demonstrator who has climbed onto an armored vehicle of the police during a protest on July 7, 2017 in Hamburg, northern Germany, where leaders of the world's top economies gather for a G20 summit. Protesters clashed with police and torched patrol cars in fresh violence ahead of the G20 summit, police said. German police and protestors had clashed already on Thursday (July 6, 2017) at an anti-G20 march, with police using water cannon and tear gas to clear a hardcore of masked anti-capitalist demonstrators, AFP reporters said. (Photo by Boris Roessler/AFP Photo/DPA)





A woman is pulled by police after she was pepper-sprayed after she climbing an armored police vehicle on the first day of the G-20 summit in Hamburg, northern Germany, Friday, July 7, 2017. (Photo by Matthias Schrader/AP Photo)





A female protestor climbs onto an armoured police vehicle during demonstrations against the G20 summit in Hamburg, Germany, 7 July 2017. The summit, a meeting of the governments of the twenty largest world economies, begins on the 7 July and concludes on the 8 July. (Photo by Boris Roessler/DPA)





A demonstrator throws a bottle towards police on the first day of the G-20 summit in Hamburg, northern Germany, Friday, July 7, 2017. The leaders of the group of 20 meet July 7 and 8. (Photo by Michael Probst/AP Photo)





Protesters throw bottles at riot police on July 7, 2017 in Hamburg, northern Germany, where leaders of the world's top economies gather for a G20 summit. (Photo by Odd Andersen/AFP Photo)





A protester shouts as riot police use water cannons trucks during the “Welcome to Hell” rally against the G20 summit in Hamburg, northern Germany on July 6, 2017. Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. (Photo by Christof Stache/AFP Photo)





Police forces put out a small fire after protestors erected burning barricades in front of the Rote Flora left-wing centre during a march on July 7, 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. As heavy protests are expected tonight at the “Welcome to Hell” anti-G20 protest. (Photo by Alexander Koerner/Getty Images)





Protestors are sprayed by police water cannons during the “Welcome to Hell” anti-G20 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. (Photo by Leon Neal/Getty Images)





A woman gestures during the “Welcome to Hell” anti-G20 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. (Photo by Leon Neal/Getty Images)





A protester blows bubbles next to German police at a demonstration during the G20 summit in Hamburg, Germany, July 7, 2017. (Photo by Kai Pfaffenbach/Reuters)





Riot police chase protesters on July 7, 2017 in Hamburg, northern Germany, where leaders of the world's top economies gather for a G20 summit. Protesters clashed with police and torched patrol cars in fresh violence ahead of the G20 summit, police said. German police and protestors had clashed already the day before at an anti-G20 march, with police using water cannon and tear gas to clear a hardcore of masked anti-capitalist demonstrators, AFP reporters said. (Photo by Odd Andersen/AFP Photo)





A young woman takes a picture of a burning barricade during a protest against the G-20 summit in Hamburg, northern Germany, Friday, July 7, 2017. The leaders of the group of 20 meet July 7 and 8. (Photo by Michael Probst/AP Photo)