Pittsburgh Bureau of Police officers from Zone 4 assisted Port Authority Police after reports of an altercation on a Port Authority bus at 7:35 p.m. at the intersection of South Braddock and Forbes Avenue.

Zone 4 officers pursued a male on foot who ran off the bus. They apprehended him a few blocks away. Port Authority Police arrived on the scene and identified him as the actor from the bus.
He was detained by Port Authority Police. The woman had an outstanding warrant and was taken into custody.

Later, Port Authority Police Interviewed the male suspect who denied any involvement. After Port Authority Police reviewed camera footage from the bus, it was determined that the female who was arrested was involved in a physical altercation with another female on the bus. The male intervened and the female pulled a knife on him before he ran. The male is not being charged.

Port Authority Police have charged the woman who pulled the knife with aggravated assault. 

Any additional questions should be directed to Port Authority as this is their investigation.