A Chicago police officer was fatally shot at Mercy Hospital in Chicago, Illinois, on Monday.

Police confirmed the shooting.

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Officer Samuel Jimenez was identified as the officer who was killed “from tonight’s senseless active shooter violence,” Anthony Guglielmi, Chief Communications Officer for the Chicago Police Department, tweeted.

“Please pray for his family, his fellow officers & the entire #ChicagoPolice Department,” he added.

Three others were wounded and remained in critical condition after the active shooting, police said.

The suspected gunman is dead.

It wasn’t immediately clear, however, if the shooter was killed or if the individual died from a self-inflicted gunshot wound.

Earlier Monday, Guglielmi said “multiple victims” were reported at the hospital.

He tweeted that “officers are doing a methodical search of Mercy hospital.”

“Chicago Police Department have secured the hospital and patients are safe,” the hospital tweeted.

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He also noted, “At least one possible offender is shot.”

The hospital confirmed just after 5:30 p.m. that a shooting took place, and that it was over.

“Chicago Police Department have secured the hospital and patients are safe,” the hospital tweeted.

The FBI is assisting the Chicago police in their investigation of the shooting.

Here are additional tweets about what happened:

Check out this video:

Fox News’ Matt Finn and Jake Gibson and the Associated Press contributed to this Fox News report, which is used by permission.

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