PHOENIX - A medical helicopter crashed in rugged terrain east of Phoenix, killing two crew members and seriously injuring a paramedic who tried unsuccessfully to save the life of another victim, a sheriff said Wednesday.

Pinal County Sheriff Paul Babeu said the helicopter crashed Tuesday evening on a mountainside about 12 miles north of Superior, a mining community outside Phoenix. An Air Force helicopter rescued the survivor, who had used a flashlight to signal at a search aircraft, about 10:15 p.m., roughly four hours after the craft went down on a snowy, tree-covered slope.

The fuselage was largely intact, but other parts of the chopper were strewn about it.

One of the victims initially had signs of life and the paramedic tried to provide life-saving care, Babeu said.

"It was not successful - a tragic situation," he said.

The Sheriff's Office and Air Methods, which owns the company operating the aircraft, identified those killed as pilot David Schneider, 51, of Gilbert, and flight nurse Chad Frary, 38, of Mesa. The surviving paramedic is Derek Boehm, 38, of Gilbert.

No patients were on board, said Air Methods spokeswoman Christina D. Brodsly.

Boehm is hospitalized in fair condition, the sheriff's office said.

Babeu said the helicopter was returning to Globe from a Mesa airport.

An aerial search began after the helicopter was reported missing around 6 p.m., Babeu said. The sheriff said he did not know about radio transmission from the aircraft before it went down or any report from the public about a crash in the Tonto National Forest.