A police officer is in critical condition and there are reports of multiple other victims - including a possible gunman - following an active shooter incident on Monday afternoon at Mercy Hospital in Chicago, Anthony Guglielmi, chief communications officer for Chicago police, said in tweets.
Guglielmi said there were "reports of multiple victims" and instructed people to avoid the area. He wrote that "at least one possible offender is shot" and that police are doing a "methodical search" of Mercy Hospital, located at 2525 Michigan Avenue.
The attack occurred about 3:30 p.m. Central time, the Chicago Tribune reports. According to an official who spoke to the Tribune, fewer than six people were believed to be shot in total. It was not immediately clear whether anyone was killed in the attack.
The wounded officer in critical condition is receiving "excellent care," Guglielmi added.
In an interview with CBS Chicago, a witness who was in the hospital said she saw blood by a hospital entrance and heard shots fired multiple times. Another witness said he saw a gunman shoot someone multiple times in a parking lot. He added that officers responded quickly and exchanged gunfire with the shooter.
According to the Associated Press, a witness named James Gray told Chicago television station ABC 7 that he saw multiple people shot: "It looked like he was turning and shooting people at random."
Police asked people to stay away from the area.