An ambulance crashed at 5:47 a.m. Thursday in Coleman County.
The Department of Public Safety said the crash occurred on U.S. Highway 84, about one mile north of Coleman.
The vehicle is a Guardian EMS Ambulance stationed in Brownwood.
It was returning to Brownwood after delivering a patient to an Abilene Hospital.
Trooper Martin Molotsky responded to the crash and reported that fatigue may have played a role.
No injuries were reported. There were two people in the ambulance, the driver and the EMS attendant.
DPS said the weather was clear and the roadway dry.