A man was in critical condition after being stabbed aboard a Pittsburgh Regional Transit bus Saturday afternoon.
The incident happened on the P68-Braddock Hills Flyer around 1 p.m., PRT officials told TribLive news partner WTAE.
Police and paramedics responded to the stabbing at the Wilkinsburg park and ride. The other person involved left before police arrived.
The man was taken to UPMC Presbyterian hospital, PRT told WTAE.
Port Authority Police were investigating.