GLENWOOD SPRINGS, Colo. (AP) — A Colorado family of four has been identified as the victims of a fatal small airplane crash.

Relatives on Sunday said in a statement that 47-year-old Jeff Makepeace, his 45-year-old wife, Jennifer, and their twin 10-year-old children, Addison and Benjamin, died in the crash late Friday.

The family from the city of Fort Collins was flying from a Fort Collins-area airport to Moab, Utah, when their single-engine plane crashed about in mountainous terrain near Glenwood Springs, Colorado about 170 miles (275 kilometers) west of Denver.

Federal authorities are investigating the cause of the crash of the Cirrus SR22. It’s a single-engine plane that can seat up to five passengers.

The statement says details of funeral services for the family are pending.