Topic - Tom Chapman

"Rest area safety is one of the issues that will be a part of this investigation," he said. "Again, we don't know enough to be able to say with certainty that that's what occurred, but that's certainly one of the issues that we'll be looking at as part of our investigation."

Greyhound bus crashes into tractor-trailers in Illinois, police say multiple deaths and injuries →

Chapman said the last satellite-based signal broadcast from the helicopter was at 6:34 p.m. The helicopter, which was on a heli-ski adventure trip with two guides and three guests from Tordrillo Mountain Lodge, was reported overdue at 8:30 p.m. Someone searching for the aircraft found it an hour later.

Feds: Owners must get helicopter wreckage off Alaska slope →