[Raw video of police press briefing embedded from YouTube page of James MacArthur, who was at the scene]

A man was shot multiple times in the back just before 6 p.m. on a lower level of an underground parking garage in the heart of the University of Maryland, Baltimore and Medical Center campus, The Sun's Steve Kilar is reporting.

The victim, who appears to be in his mid-40s, is in critical condition but stable at a local hospital, said Detective Kevin Brown, a police spokesman. After the shooting, the assailant fled, he said. No shooter description was available by 9:15 p.m.

Police union President Robert F. Cherry, attributing information to a source, said on the union's Twitter page that the victim was a hospital patient who was robbed and shot three times. Cherry claimed the victim had been previously stabbed in a home invasion and treated at Shock Trauma.

Later, apparently incredulous that the city had not released more information, Cherry tweeted: "A patient leaving the University of Maryland is robbed and shot and no news from the BPD or City? This should outrage every citizen!"

Officers were still conducting a forensic investigation of the scene about 7:15 p.m., Brown said, and surveillance footage will be reviewed.

The University Plaza Garage, which is owned by the university and has an entrance off Redwood Street between Greene and Paca streets, is six floors deep, according to Patricia Fanning, a spokeswoman for the University of Maryland, Baltimore.