Suffolk County police said they are investigating an all-terrain vehicle crash early Sunday morning that left a Northport man with serious injuries.

Police said Joseph Pace, 32, was operating a 2011 Polaris ATV westbound on Jefferson Street at 1:10 a.m. when he apparently lost control of the vehicle and it overturned.

Pace was flown by Suffolk County police helicopter to Stony Brook University Hospital for treatment, police said.

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The ATV was impounded for a safety check and the investigation is continuing.

Anyone with information is asked to call the Second Squad at 631-852-8252.