Suffolk County police are investigating a crash on the Long Island Expressway in Medford that seriously injured a Riverhead man Saturday morning.

The accident occurred at 6:18 a.m. when a 32-year-old Riverhead woman was driving a 2007 Kia eastbound and her vehicle struck a 2002 Ford van, which was stopped on the shoulder.

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The driver of the Kia sustained non-life-threatening injuries, but her passenger, a 33-year-old Riverhead man, suffered serious injuries. Both were taken to Brookhaven Memorial Hospital Medical Center in East Patchogue.

The driver of the van, a 49-year-old man from Nesconset, was not injured.

Police had initially said the passenger of the Kia was female.

The eastbound lanes of the LIE were closed for three hours Saturday morning between Exits 63 and 65 for the accident investigation.

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Both vehicles were impounded for safety checks, and the investigation is continuing. Anyone who may have witnessed the crash is asked to contact the Sixth Squad at 631-854-8652 or call anonymously to Crime Stoppers at 800-220-TIPS. All calls will remain confidential.