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CHICAGO — Authorities say a teenage boy was shot and killed by an off-duty Chicago police officer during an attempted armed robbery early Thursday on the Northwest Side.

According to police, the off-duty cop was returning from a movie theater and sitting in his parked car on the 5800 block of north Talman Avenue when two teenage boys, one of them armed, demanded his wallet and phone around 2:30 a.m. Thursday.

Police say the officer initially complied and handed over his property, but the situation escalated after one of the teens reached into the car to pat him down and discovered his badge.

“They see the police star, the offender with a weapon points the weapon at our officer and tells him not to move. The officer, knowing that he is armed, is forced to pull out his weapon and he fires at the individual armed with a gun, striking that individual,” CPD Deputy Chief Al Nagode said.

The 16-year-old shot by the officer was taken to a nearby hospital, where he died. Authorities have not yet released his identity, but police say the teen’s father had reported him missing, saying his son had stolen his gun. Police say a gun recovered at the scene matches the one reported stolen.

The second, 17-year-old suspect ran away with the officer’s belongings but was taken into custody a short time later.

The officer involved will be placed on routine administrative duties for 30 days, and the shooting is being investigated by the Civilian Office of Police Accountability.