The Syrian government has increasingly been using helicopters and other aircraft in its fight against the rebels|”We heard the sound of several explosions and some gunfire, and a few minutes later, we were told that a helicopter had crashed,” said Mohammad Saeed, an activist in Douma|In Thursday’s incident, the helicopters rotor clipped the tail of a Syrian Arab Airlines jet, the state TV said|The helicopter crashed near the capital of Damascus, though it was not clear if there were any casualties in that crash or what had led the two aircraft to touch in mid-air}