Berlin, Aug 23: A small plane collided with a glider over southern Germany today, and all six people aboard the two aircraft were believed to have died in the accident, police said. The single-engined Cessna had taken off from Burgheim, northwest of Munich, carrying four skydivers in addition to the pilot. It was unclear why the plane collided with the glider, said Josef Baur, a spokesman for police in the town of Donauwoerth. Bureau Report