Boston Police say a 22-year-old man shot inside the John Marshall Elementary School gym last night "is well known to law enforcement" and that he attempted to flee the scene rather than wait for help.

Police say the man, shot shortly before 7 p.m. at a community basketball session at the Westville Street school, was found on Corona Street. He was taken to a local hospital for treatment.

"The preliminary investigation has determined that this was not a random incident and the victim is believed to have been the target," Boston Police said in a statement. "The victim is well-known to law enforcement and has been uncooperative with the investigation."

Police Commissioner Ed Davis said he was alarmed by "the brazeness" of the shooting. "As a community, we must have no tolerance for this."

This is the second gun incident in or near the school this month. On Nov. 3, a man was shot to death at Bowdoin and Westville streets.

Davis said police are stepping up patrols in the area around the school and will be going after "impact players" who might have something to do with the shooting. The city is also assigning school police officers, street workers and a trauma team to the school, he said.

Anybody with information about the shooting should contact detectives at 617-343-4335 or contact the anonymous tip line at 1-800-494-TIPS or by texting the word TIP to CRIME (27463).