Washington ? An Army Blackhawk helicopter crashed on a mountain southeast of Seattle during a training mission, killing all three people aboard, military officials said Friday.

The UH-60 went down about 9 p.m. Thursday, according to a statement issued by Fort Lewis, an Army post south of Tacoma.

Searchers found the first two bodies quickly, then discovered the third Friday morning in the same general area, said Lt. Col. Dan Williams. He said the remains will undergo autopsies.

The Army notified the family of Sgt. Thomas Clarkston Jr., 25, of Liberty, Ind., that he was among those killed, his father, Thomas Clarkston, told The Associated Press.

The Army would not confirm Clarkston was one of the dead and did not plan to release the names of all three until 24 hours after the families had been notified, said David Kuhns, a civilian spokesman for Fort Lewis.

Clarkston was the crew chief of the Blackhawk, overseeing navigation and other duties, his father said.