A total of 12 police officers had to abandon service due to the injuries, the Welt newspaper reported.
"A police helicopter was attacked with a flare in the Altona area. The missile missed the helicopter only narrowly," police said in a press release earlier in the day.
Clashes continue on the first day of G20. Hamburg police use pepper spray against protesters. pic.twitter.com/EVKMIfmOIr— Denis Bolotsky (@BolotskySputnik) July 7, 2017
Protest marches continue as G20 leaders are holding their first meetings in Hamburg. pic.twitter.com/3X2G2od7pT— Denis Bolotsky (@BolotskySputnik) July 7, 2017
On Thursday, Hamburg police said that a total of 13,970 people gathered at various anti-G20 protests across Hamburg on Wednesday.
Late on Thursday, police resorted to water cannon as 8,000 people gathered past 9 p.m. local time (19:00 GMT) in the St. Pauli football fan area and the Reeperbahn red lights district before they set out toward the G20 summit site.