A man is in serious condition after a crash in St. George, police said.

The incident happened at 2450 South and River Road, where a woman driving a car was also involved.

Northbound traffic is closed at the intersection, and westbound traffic is shut down at 1800 East, officers said. They asked people to avoid the area.

They said the call for the crash came in just after 7 p.m. Saturday. The motorcyclist was unconscious but breathing, officials said, and in serious condition.

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He was not wearing a helmet at the time of the crash, they added.

Utah Highway Patrol officials are assisting police who said they are in the process of reconstructing the scene to learn details.