CONCORD (CBS SF) — A school bus carrying Mount Diablo Unified School District students was involved in a crash near Concord Thursday afternoon, according to the California Highway Patrol.

The crash was reported at about 3:45 p.m. near the intersection of Willow Pass and Avila roads, CHP officials said.

The initial investigation indicated that the bus was involved in a collision with a minivan.

An ambulance was called, but CHP officials could not immediately say if anyone was injured.