Officials say 300 U.S. Marine, Army, Air Force and Navy personnel involved in rescue operations in Nepal since a major earthquake struck last month have concluded their work.

Commander of the U.S. joint task force in Nepal Lt. Gen. John Wissler said the operations ended Wednesday and they will begin leaving Nepal, where they brought in helicopters and other aircraft to assist in rescue and relief.

Powerful earthquakes on April 25 and May 12 killed at least 8,622 people.

A U.S. Marines UH-1 "Huey" helicopter crashed last week while on a rescue mission in the mountains, killing six Marines and two Nepalese soldiers.