A military helicopter crashed on the outskirts of Ho Chi Minh City early Wednesday killing four soldiers, dpa cited a senior army official as saying. "The helicopter was in a training session when it took off at 7.15 am [0015 GMT] from Tan Son Nhat airport," Lieutenant General Vo Van Tuan told dpa. "Eight minutes after take-off it lost contact," the deputy chief of the General Staff of the Vietnam People's Army said. The US-made UH-1 Iroquois, known as a Huey, was destroyed in the crash, whose cause was not yet known, he said.