(MARYDEL, Md.) - The Maryland State Fire Marshal's office has ruled a school bus fire as accidental in Caroline County.

Fire investigators responded to a fire on a school bus reported by a motorist at around 9:00 a.m. Sunday on the 25000 block of Shults Road in Marydel. Investigators said the bus belongs to the Caroline County Board of Education.

The fire was caused by a mechanical failure in the engine compartment and cost around $40,000 in damages. Investigators said no injuries were reported.