A car-horse collision on U.S. Highway 91 injured nine people, but only one remained hospitalized Friday, said Washington County Sheriff's Deputy Jim Webb.

Webb said the brown quarter horse that had wandered onto the road into traffic was dead at the scene of the Thursday night accident.Leif Erickson, 19, of Ivins, was driving southbound when he hit the horse, which smashed his windshield and the top of his car. He was in stable condition Friday at Dixie Medical Center.

His passengers, Leilaine Erickson, 17, and Rinar Erickson, 15, were treated and released.

Webb said the collision triggered a chain reaction accident.

The Erickson car swerved into oncoming traffic in the northbound lane and struck a vehicle driven by Christopher Robbins, 18, of St. George.

The Erickson car continued southbound and struck a second vehicle, a van driven by Becky Pitts, 30, of Ivins. Her three children were passengers in the van.

The Erickson car then plowed through a fence and into a field.

The accident closed U.S. 91 from about 7 p.m. to 9 p.m., authorities said.