A shot fired after an argument aboard a SEPTA train Wednesday night critically injured a Chicago Bulls fan and wounded another man.

The Bulls fan, 36, had been arguing with two teens aboard a westbound Frankford-Market El train after the Sixers lost to Chicago NBA team, 96-89, at the Wells Fargo Center.

As the teens disembarked, about 10:39 p.m., at the 46th Street elevated stop, one turned and fired through the open train door, police said. The bullet hit the Bulls fan in the side of the stomach, went through them, and then struck another in the thigh.

Both were taken to the Hospital of the University of Pennsylvania, where the Bulls fan was in stable condition this morning, police said.

"Unfortunately, we've got two young idiots who don't know how to control their anger and don't know how to respect themselves and respect society," Lt. John Walker of Southwest Detectives told reporters Wednesday night. ". . . Instead of just letting this argument die off, walking off the train, and doing what you're supposed to do, they take a wild shot into a train that's loaded with people of all ages, male and female."

About three dozen people were aboard the train at the time.

Police hope surveillance video will lead an arrest.

Anyone with information about the case is asked to call Southwest Detectives at 215-686-3183 or -3184, or the Police Department's anonymous tip line: 215-686-8477 (215-686-TIPS). Tips can also be texted to PPDTIP or 773847.

Contact staff writer Peter Mucha at 215-854-4342 or pmucha@phillynews.com.