Trooper Tim Sutherland said no other vehicles were involved in the accident when the car went off the road and rolled several times.

The State Patrol sent out a tweet calling it a “horrible” accident. Authorities could not immediately say if the accident involved adults or children, and whether they were male or female.

He said investigators had a hard time determining the make of the vehicle because the fire was “devastating.”

“It looks like excessive speed was a factor,” he said.

The accident happened about 6 a.m., east of Parker, which is about 25 miles southeast of Denver.

The highway was closed for seven hours while the investigation was conducted.