The Independent Police Review Authority said the teen was shot by an officer near 93rd and Chappel on Friday afternoon.
The circumstances of the shooting are still under investigation.
Witnesses say the whole thing started about a block away, in the parking lot of a fast food restaurant. That's where police were apparently trying to question three young men. A witness says one of those men took off before a police pursuit began.
Officials said the teen was shot in the leg and taken to Christ Medical Center in critical condition.
Preliminary Statement from Chicago police:
"At approximately 3:15 p.m., on March 29th, Area South Detectives heard shots fired in the area of 95th and Jeffery. The detectives radioed for assistance and followed as three subjects fled northbound on Jeffery from 95th St. In the 2000 block of E. 94th St., one subject was taken into custody and two continued to flee. As the detectives continued to pursue one of the subjects, they noticed that he was in possession of a weapon. Detectives ordered the offender to drop the weapon. The offender did not comply with the order and instead pointed the firearm in the direction of the detectives. Due to this action on the part of the offender, the detectives were placed in fear for their lives and discharged their weapons, striking the offender. The offender was placed into custody and transported to an area hospital. A weapon was recovered at the scene. No police were injured during the incident. The third subject is still being sought at this time."