UPDATE:— At least one police officer was shot during an “active shooter situation” near a Chicago hospital Monday afternoon, according to police. Anthony Guglielmi, a Chicago police spokesman, said the officer was in critical condition and receiving treatment.

Guglielmi said officers are doing a methodical search of Mercy Hospital & Medical Center on Chicago’s south side. 

Guglielmi tweeted earlier that at least one possible offender had been shot and that police were responding to report

A massive law enforcement presence was seen on the campus and medical staff were seen being evacuated form the area. Guglielmi urged citizens to avoid the area.

Witness Hector Avitia told CBS Chicago he was inside the hospital waiting for test results for his wife when he saw a gunman outside in the parking lot, dressed in black, fire on someone on the ground multiple times.

Avitia said an officer arrived on the scene in an SUV and the gunman fired at the officer. He said he saw the gunman reload, fire again at the person on the ground and then go inside the hospital where more shots were fired.

He said the gunman was carrying a handgun with multiple clips.

CHICAGO (CBS)— Police responded to reports of multiple victims from a shooting near a Chicago hospital Monday afternoon, according to Chicago police. At least one possible offender is shot, police said.

Chicago police spokesman Anthony Guglielmi tweeted Monday afternoon that there were reports of shots fired in the vicinity of 26th and Michigan, near Mercy Hospital & Medical Center on the city’s south side. Law enforcement was responding. 

Guglielmi said officers are doing a methodical search of Mercy hospital and asked the public to avoid the area.  

Medical staff were seen being evacuated form the area. Guglielmi urged citizens to avoid the area.

This is a developing story and will be updated.