The names of four Colorado men killed in a plane crash near Bullfrog have been released.

Killed were:Robert S. Sweitzer, 52, Gunnison, Colo.

Gregory F. Rielly, 34, Gunnison, Colo.

Todd A. Peterson, 36, Crested Butte, Colo.

Gregory S. Joch, 36, Crested Butte, Colo.

The men died when their small plane crashed and caught fire about 10 a.m. Saturday at an airstrip three miles from the shores of Lake Powell near Bullfrog.

The Cessna 210 can carry up to six people and was registered to High Country Flying Club in Gunnison, Colo. It is unknown who was piloting the turboprop plane when it crashed.

An official from the National Transportation Safety Board in Seattle completed his on-scene investigation Sunday, said NTSB senior air safety investigator Michael Stockhill. The investigation now moves into the fact-finding stage, Stockhill said.

Tim Mason, an investigator with the Federal Aviation Administration's Salt Lake office, was in Moab for an air show on Saturday and arrived at the site about two hours after the Cessna 210 crashed. Mason was out of town Monday and unavailable for comment.

Char Obergh, management assistant for the Glen Canyon National Recreation Area, said the paved airstrip is owned and operated by the National Park Service.

There is no air tower, and most landing pilots radio in to the nearby hotel, which acts as a shuttle service for fliers, Obergh said.