State police said Wednesday that alcohol and failure to wear seat belts were contributing factors in a rollover accident near Chama that left two people dead.

Joe Valdez, 45, of Dulce and Charlene Gonzales, 38, of Albuquerque were killed when a 1988 Ford Ranger pulling a camper trailer crashed Tuesday afternoon on N.M. 112.

They were ejected along with a third occupant, 49-year-old Anthony Montoya, who was taken to Española Valley Medical Center for treatment following the accident.

A statement issued by a police spokesman said investigators were still trying to determine who was driving the vehicle, and the state Office of the Medical Investigator in Albuquerque planned to conduct autopsies on Gonzales and Valdez, who were pronounced dead at the scene.

The vehicle drifted off the roadway "for an unknown reason," the statement said, then crossed back onto eastbound lanes, causing the vehicle and trailer to jackknife. The trailer subsequently broke loose, and the pickup rolled.