A bus carrying 32 kindergarten students has collided with a sport utility vehicle that crossed the center line, authorities said. All of the students have been taken to a hospital with bumps and bruises.

Dorchester County Sheriff's Sergeant Mike Miller told The Post and Courier of Charleston that the driver of the county-owned SUV was airlifted to a hospital and was in serious condition.

Miller said the county vehicle crossed the center line on U.S. Highway 78 shortly after 9 a.m. and hit the bus.

The Harleyville-Ridgeland Elementary School students were headed to Charleston on a field trip, according to a school district spokesman.