A Chicago police officer and two hospital employees are dead after a gunman open fired at the city's Mercy Hospital on Monday. Police said the suspect was found dead on the scene.

Details: The shooting apparently began following a domestic dispute between the gunman and a woman outside the hospital, the Chicago Tribune and the AP report. The suspect reportedly shot the woman in the chest several times before entering the hospital and continuing to fire.

• Officer Samuel Jimenez has been identified as one of the victims.
• It is unclear whether the gunman killed himself or was shot by police, authorities said.
• James Gray, a witness, told the Tribune and the AP that the suspect appeared to be shooting people at random: “It was chaos. It was just mass chaos,” Gray said.

Mayor Rahm Emanuel, in a statement on Monday: "The city of Chicago lost a doctor, pharmaceutical assistant and a police officer, all going about their day, all doing what they loved. This just tears at the soul of our city. It is the face and a consequence of evil."