NEW YORK (AP) - New York City police are questioning a man in the killing of an on-duty bus driver who was stabbed in front of horrified passengers.

No charges have been filed, but a person of interest is being interviewed at a police precinct.

The victim, 46-year-old Edwin Thomas, was driving the B-46 bus in Brooklyn when the attacker got on shortly after noon Monday.

Police say the man swiped an invalid fare card and sat down before asking for a transfer slip.  When Thomas told the man he didn't pay for the ride and couldn't get a transfer, the man punched him in the head and stabbed him in the torso.

Thomas was rushed to a hospital, where he died.  The attacker ran away