An 18-year-old man was in critical condition after being stabbed twice on a Muni bus in the Outer Mission district Wednesday afternoon.
The victim got into a fight on the bus with another man in his late teens at around 1:40 p.m., police said. The suspect stabbed the victim twice, then fled on foot with a 17-year-old girl, police said.
Police are hunting the teens.
Further information on the attack was not immediately available.