SILVERTON, Colo. (AP) — A helicopter is bringing searchers to the remote site in the southwestern Colorado mountains where five people died in a plane crash.

National Transportation Safety Board spokesman Peter Knudson says no one survived when the twin-engine Cessna 310 went down at 4:15 p.m. Sunday.

The victims’ names and hometowns haven’t been released. There’s no immediate word on the cause.

Knudson couldn’t say whether the plane is the same Cessna 310 reported overdue on a flight from Barstow, California, to Amarillo, Texas.

The plane crashed near Silverton in the San Juan Mountains. A San Juan County Sheriff’s Department search team was at the scene, and an NTSB investigator was en route.

A team from neighboring La Plata County is assisting. La Plata officials say a National Guard helicopter is being used to reach the remote site.