THE BRONX - Officials are investigating who is responsible for firing shots at the window of a police car in the Bronx.Police say the incident happened early Friday morning on Undercliff Avenue. At the time of the shooting, officials say the officers were inside a building responding to a call of shots fired.According to officials, the officers called for an armored car when they realized their police car was shot at. Officials say the car arrived and the officers were able to safely exit the building.Police say they are still investigating the incident and do not know how many suspects were involved in the shooting.