A man questioned in Tuesday evening's shooting outside a Baltimore high school basketball game has been released without being charged as police continue to search for the gunman behind an attack that forced the teams into lockdown and shut down public transportation at a busy mall.

The Baltimore Police Department's chief spokesman, Anthony Guglielmi, said on Wednesday that detectives have spoken with witnesses and are reviewing surveillance tapes from the Mondawmin Mall transit hub, which is near where the shooting occurred outside Frederick Douglass High School on Gwynns Falls Parkway.

The 19-year-old victim, who was not identified but according to police has twice been charged with assault with intent to murder and is on probation until 2012 on a felony charge, was wounded in the face and is being treated at an undisclosed hospital. Guglielmi said he has not been able to speak with investigators. He is not a city school student.

Neither school officials nor police could say whether any guns had been inside the gym or school before the shooting, which occurred toward the end of Douglass High's upset 71-68 overtime victory over Patterson. But the shooting has raised questions about whether spectators should have passed through one of the school's metal detectors before being allowed into the gym. Athletic officials told The Baltimore Sun on Tuesday night that the detectors weren't used because the two teams aren't rivals, the crowd was "medium-sized" and there is no history of hostilities between the two schools.

School principals were allowed to purchase metal detectors in 2007. System administrators allow principals, with input from the community and law enforcement, to decide how and when to deploy the devices. "It's at the discretion of the school administrator," said schools spokeswoman Edie House.

Douglass High's principal, Clark Montgomery, could not be reached for comment.

House noted that the victim was not a student and that the shooting occurred on a public street near the school. "This is not about Douglass," she said. "It's about community. I don't think the school had any role to play."

But she did say that the shooting may force principals to "think about again" the use of metal detectors. She added, "It's all about safety."

Police said the victim, his girlfriend and another girl left the school gym apparently toward the end of the overtime period. The police said a dispute broke out and the man was shot on a median strip of Gwynns Falls Parkway between the school and the mall.

The players were inside their locker room when they got word about the shooting and were ordered to stay there until the scene quieted and they could leave through a safe exit. The victim ran into the mall, leaving a trail of blood, and collapsed at a Metro stop. A possible suspect was last seen boarding a Metro train.

Guglielmi said police found a silver semiautomatic Beretta handgun on the mall's parking lot and a .40-caliber Smith and Wesson handgun at a business on Gwynns Falls Parkway. They do not know if either weapon was used in the shooting.