CHESTER COUNTY, Pa. (CBS) — Police are investigating a serious accident involving a school bus in Chester County, Tuesday morning.

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It happened near Route 113 and Devon Drive in Lionville, Uwchlan Township, just after 8 a.m.

Police say there were no children on the Downingtown School District bus at the time and the bus driver is OK.

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No word on the other driver’s condition or what caused the accident.

Authorities say the Chester County medical examiner responded to the scene.

Stay with for updates on this developing story.