RIO DE JANEIRO,  (Reuters) – Drug traffickers shot  down a police helicopter in Rio de Janeiro on Saturday, killing  two officers, and 10 suspected gang members were killed in the  city’s worst recent outbreak of violence, police said.

The violence, in which authorities said 8 buses were set on  fire by suspected traffickers and 6 police officers wounded,  came only two weeks after the Brazilian city was awarded the  2016 Olympic Games despite worries over high levels of  violence.

The helicopter carrying six crew came down after its pilot  was hit in the leg by a bullet as it flew over the “Hill of  Monkeys” slum in the city’s north zone, where police were  responding to a gun battle between rival gangs, Major Oderlei  Santos of the military police told Reuters.

He said it was the first time that a police helicopter had  been shot down and destroyed in Rio.

Despite being wounded, the pilot managed to land the  aircraft on a football pitch but it then exploded in flames,  killing two officers and wounding the other four crew members,  including the pilot, one of them gravely.