An ambulance and police car collided Wednesday night on the Long Island Expressway, Suffolk County police said.

The Suffolk County Highway Patrol car was slowing down in the eastbound HOV lane about 8:05 p.m. to make a U-turn at a break in the concrete median between Exits 53 and 54, police said.

A Senior Care EMS ambulance behind the patrol car struck it in the rear and forced it into the median, police said.

The officer was treated for minor injuries at Stony Brook University Hospital and a female patient in the ambulance was taken to Southside Hospital in Bay Shore with minor injuries, police said.

The ambulance driver and an attendant were not injured, police said.

Suffolk County police said in a statement that the officer had turned on the vehicle’s emergency lights before starting the turn.

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A police spokeswoman could not say whether the emergency lights on the ambulance had been activated, but said the police vehicle had not been escorting the ambulance.

The spokeswoman said no summonses were issued.

The ambulance company did not immediately respond to a telephone message left at its New York City office.