MISSOULA, Mont. (NBC Montana) — An investigation of a report of a shot being fired at a police car that led to an hours-long lockdown in downtown Missoula has found no indication of any bullets in the car.

Interim Police Chief Mike Colyer said Tuesday an X-ray of the car did not find any projectiles in the vehicle.

An officer reported his back window was shot on Feb. 12 while he was driving in the downtown area, resulting in a lockdown and search for a possible gunman.

The case is still under investigation but Colyer says it's possible there was a manufacturer's defect with the window.