The latest on a Philadelphia police officer shot while sitting in a police cruiser (all times local):

7:15 a.m.

Philadelphia police have identified the officer who they say was ambushed while sitting in his marked cruiser as Officer Jessie Hartnett.

Officer Christine O'Brien of the Philadelphia police says Friday that Hartnett is in stable condition at a hospital, hours after being shot three times in the left arm.

Police Commissioner Richard Ross says the officer returned fire late Thursday night and hit the suspect at least three times. O'Brien says the suspect, whose name has not been released, was struck in the buttock.

Police say the suspect fired a total of 13 shots that hit the officer and his cruiser.

Ross says the shooting was unprovoked. He calls it one of the scariest things he's ever seen.

There's no word on the suspect's condition.

A motive for the shooting remains unclear.

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2:15 a.m.

Philadelphia police say an officer is undergoing surgery after he was shot three times in the arm by a man who ambushed him as he sat in his marked police cruiser.

Police Commissioner Richard Ross says the officer returned fire late Thursday night, hitting the suspect at least three times.

Police say the suspect fired a total of 13 shots that hit the officer and his car.

Ross says the shooting was unprovoked. He calls it one of the scariest things he's ever seen.

Both were taken to area hospitals. There's no word on the suspect's condition. The officer is expected to survive.

A motive for the shooting remains unclear.