A motorist, probably dozing at the wheel, caused a three-car crash early Saturday in East Moriches, ramming a parked Suffolk County Sheriff's patrol car and then another vehicle stopped for drunken driving, authorities said.

The accident occurred at 12:37 a.m. on westbound Sunrise Highway on top of the County Road 111 overpass, said Sheriff's Chief Michael Sharkey.

Deputy Sheriff John Bing had pulled over a motorist, Arturo Giraldo, 44, of Holbrook, for allegedly driving his 2000 Mercedes-Benz while intoxicated, Sharkey said.

Bing was about to perform a roadside sobriety test on Giraldo when another vehicle, a four-door Lexus sedan, slammed into both vehicles, Sharkey said.

The driver, Sharkey said, "was potentially dozing off at the wheel" and was taken to Brookhaven Memorial Hospital Medical Center in Patchogue with injuries that were not considered life-threatening.

The driver of the Lexus, who was not identified by police, was not charged.

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Bing and Giraldo were not injured, he said.

Giraldo was charged with driving while intoxicated and aggravated unlicensed operation of a vehicle. Giraldo's license had been previously suspended for another DWI arrest, Sharkey said.