Police: Unmarked Police Car Involved in Hit and Run

Essex County Sheriff's deputies are searching for a car that fled after striking an unmarked police car and caused it to overturn late Wednesday afternoon, officials said Thursday. 

The accident, which occurred around 5:45 p.m. on Nassau Street lodged the black Ford Crown Victoria in between a pole and a CVS Pharmacy.

According to officials in the sheriff's department, the police car, which was driven by an off-duty detective, was heading West on Nassau Street towards South Valley Road when a car backed out of a parking spot and struck the police car.

The detective then lost control of the car and hit a fire hydrant, which flipped the police car on its side, officials at the sheriff's department said. 

The unknown car fled after hitting the police car, officials said. Two witnesses couldn't identify the fleeing car.   

The detective was uninjured and back on duty Thursday, officials said. 

The investigation is continuing. 

This is an update from a previously reported incident on Wednesday.