LUKLA, April 15 -- A co-pilot of Summit Air and two police personnel died when a Twin Otter plane skidded off the runway and collided with a parked helicopter at Lukla airport on Sunday morning. Three of the four crew members and ground handling staff who sustained injuries in the crash are undergoing treatment in Kathmandu.

The Czech-built LET 401 Twin Otter of Summit Air was about to takeoff for Kathmandu when it lost control, veered off the runaway and crashed into the parked helicopter of Manang Air at 9.20 am, according to Narendra Kumar Rana, chief district officer of Solukhumbu district. Officials said that they were trying to ascertain the cause of the accident.

"The plane veered off the runaway before crashing into a parked hel...