(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 beinginterviewed at a police precinct.

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

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

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

Citybus driver fatally stabbed in Bed-Stuy