Story highlights

Two school buses collided outside a high school

Three kindergarten-age children are taken to a hospital

CNN —  

A school bus driver was killed Monday when two school buses crashed outside a high school in a suburb of San Antonio, Texas.

At least six children of kindergarten age were aboard the buses when the crash happened, said Barbara Castillo of the Bexar County Sheriff’s Office. Three of the students were taken to a hospital, according to CNN affiliate KENS.

Castillo said it wasn’t immediately clear where the buses were going, and investigators were trying to determine what happened.