LUSK, Wyo. — Two South Dakota women and a Colorado man have been killed in a rollover north of Lusk, Wyoming.

The Wyoming Highway Patrol says a fourth person was injured when a minivan drifted off U.S. 85, struck a driveway, became airborne and rolled early Monday.

Authorities identified the dead as 59-year-old Suzanne Schermerhorn and 86-year-old Nola Reber of Rapid City, South Dakota, and 34-year-old Robert Bentz of Westminster, Colorado.

Twenty-six-year-old Krystal Sandoval was taken to a hospital. Her condition and the nature of her injuries haven't been released. Her hometown wasn't available.

The patrol says Bentz was the driver. Investigators say none of the occupants was wearing a seat belt, and the three people killed were ejected.

Troopers are investigating whether speed, fatigue and prescription medication contributed to the crash.