Rescue workers examine one of two crashed helicopters of the German federal police on a field at the Olympic Stadium in Berlin, Germany, March 21,2013. The two helicopters collided as

 

              Rescue workers examine one of  two crashed helicopters of the German federal police on a field at the Olympic Stadium in Berlin, Germany, March 21,2013. The two helicopters collided as
Rescue workers examine one of two crashed helicopters of the German federal police on a field at the Olympic Stadium in Berlin, Germany, March 21,2013. The two helicopters collided as they approached for landing during an exercise of the federal police .(AP Photo/dpa/ Hannibal Hanschke)
Tags: Police