WEST MIFFLIN, Pa. (KDKA) – A large oil spill is spanning across three lanes of traffic on Clairton Boulevard in West Mifflin.

On Twitter, Allegheny County says there’s an oil spill on the 200 block of Clairton Boulevard.

Police and fire crews are on scene. One northbound lane is closed at this time.

Officials did not say what led to the spill.

Stay with KDKA for the latest on this developing story.