Two German police-operated helicopters returning from a training mission collided near the ground in Berlin while landing on March 21. Both were Eurocopter models, one an AS332L1 Super Puma and the other an EC155B1. The pilot of the Super Puma lost ground reference in blowing snow and struck the smaller helicopter, killing the pilot of the EC155. Seven people on the ground were also injured–four seriously–mostly by flying debris. The two helicopters were participating in a police exercise being held near Berlin’s downtown Olympic Stadium. A portion of the accident was captured on video.