West Mifflin police said no one was injured in an 11-vehicle crash late Monday along Lebanon Church Road.
Police said a Port Authority of Allegheny County bus and 10 other vehicles were involved in the crash that was first reported just before 11 p.m.
A broken water line caused the road to ice over and led to the crash, police said.
The roadway was reopened by 12:30 a.m., according to police.
