Medical staff and policeman among four dead during shooting in Chicago

Four individuals have passed on in a shooting at a Chicago doctor's facility, including two female individuals from staff and a cop, and the shooter himself. 

The two ladies slaughtered were a specialist and a pharmaceutical right hand, Mayor Rahm Emanuel affirmed.A police spokesman said the gunman had died in an exchange of shots, but it is not clear if he took his own life.

A second officer avoided injury after a bullet fired in his direction became lodged in his gun, police say.

Authorities say the shooter seemed to focus on a lady with whom he was seeing someone they don't recommend a thought process.

"Chicago lost a doctor, pharmaceutical assistant and a police officer, all going about their day, all doing what they love," said Mr Emanuel. "This tears at the soul of our city. It is the face and the consequence of evil."

Police say it started with a row in the car park between people who knew each other.

The gunman first shot the woman he apparently knew and then headed inside the building, closely followed by several police officers. More shots were fired, apparently at random.

Mercy Hospital was quickly evacuated during the incident as armed police descended on the scene.

The hospital later confirmed that police were able to secure the area, ensuring the safety of dozens of patients.