A man who claimed to be an off-duty Chicago police officer pinned a 14-year-old boy to the ground with his knee after accusing him of stealing his son's bike. According to the boy's parents, the incident took place at a Starbucks in Park Ridge, Illinois. Their son, who is Puerto Rican and an honor student, athlete and member of the local church was at the coffee spot with a group of friends and saw an abandoned bike on the sidewalk. The boy tried to get the abandoned bike out of the way, but an off-duty officer pounced on him. The man's son's bike had been taken from a nearby location. The other teens came to their friend's defense and pulled him away from the man. The man told the Park Ridge police that he was an off-duty Chicago police officer. An internal investigation is being conducted by the Chicago Police Department, according to a rep. The parents of a 14-year-old are angry because their son was the only kid in the group who was of a different ethnic background. Park Ridge tells us that no arrests have been made.