One Chicago police officer was killed and a second was critically wounded when a prisoner who was receiving treatment opened fire inside Swedish Hospital in Chicago’s Lincoln Square neighborhood Saturday morning, authorities said. The suspect was later arrested following a nearby standoff. 

In a news conference, Chicago Police Superintendent Larry Snelling said a 38-year-old officer and 10-year veteran of the department was killed in the shooting, which occurred at approximately 10:50 a.m. local time. A 57-year-old officer and 21-year veteran of the department was critically wounded. The officers were rushed to an area hospital, where one died, police said. No names were immediately released. 

Law enforcement sources told CBS News Chicago the prisoner had somehow managed to get hold of a gun and shoot the officers. 

The gunman then fled the hospital to a nearby home several blocks away, sources said. SWAT teams surrounded the home and later placed the suspect into custody. Snelling said that a third gun was recovered, which police said happened during the suspect’s arrest.

Snelling disclosed that the suspect had been originally arrested on suspicion of robbery, and he had been taken to Swedish Hospital for observation prior to the shooting. 

In a statement, Endeavor Health said that no hospital staff or patients were injured during the incident. 

“We are cooperating with law enforcement during their investigation and our deepest compassion remains with the officers and their families,” Endeavor said.   

The shooting also prompted Chicago Alderperson Andre Vasquez to ask residents to shelter in place. 

“We got word to neighbors to steer clear of the area,” he said. “And we get the information necessary to make sure justice is served, and we get information about what may need to be improved as far as protocol if there were something that may have occurred there that allowed this to happen.”

Snelling and Mayor Brandon Johnson said Saturday’s shooting is a reminder of the dangers that officers face.  

“These are the dangers of policing,” Snelling said. “This is a very, very and extremely dangerous profession, but officers go out there every single day, and they do this work knowing that when they go into these environments, they’re not safe, but they accept that and that’s the work they do.”

“I want to thank our Chicago police department for showing up every single day for the people of this city. I want to thank the City of Chicago for putting their arms around our officers,” Johnson said. “This tragedy and this loss is not only heartbreaking, but it’s a constant reminder of why we have to continue to ensure that our police department has the services and resources that they need to effectively do their job.”

A procession was held for the fallen officer from Illinois Masonic Hospital to the Cook County Medical Examiner’s Office.