GALVESTON -

A man faces an intoxication manslaughter charge after police said he crashed into a horse-drawn carriage, killing one person and injuring four others.

Police said Mike Grayson, 21, of Conroe, slammed his car into a horse-drawn carriage carrying four people at the intersection of 21st Street and Avenue L in Galveston about 11 p.m. Saturday. Officers said Grayson then tried to run from the scene, but witnesses kept him there until police could arrive.

"Immediately, I heard screaming. And it wasn't just one voice screaming. It was four or five people," witness Jan Moriarity said.

"The carriage actually rolled over three times and the carriage was sitting on top of the car," witness Kenneth Young said.

Police said everyone in the carriage and one passenger in the vehicle had to be taken to the hospital. One of those victims later died.

Investigators said a family was taking the carriage back to their hotel when the crash occurred. The victims' names were not released.

Police said Grayson failed a sobriety test, and later admitted he had been drinking. Investigators said Grayson stated he'd been on medication at the time of the accident. Grayson was taken to the hospital for a mandatory blood draw.

Officials said the horse suffered a cut to its left leg and was taken to a nearby veterinarian clinic.

Grayson has been charged with three counts of intoxication assault and one count of intoxication manslaughter.

Investigators said he was driving more than 100 mph at the time of the collision.