A motorcyclist and his passenger who collided with a moving Jeep in North Babylon Saturday afternoon are hospitalized with "multiple fractures," Suffolk County police said.

The motorcyclist is in critical condition; the passenger is stable, police said.

The 4:45 p.m. collision, on Commack Road and Drakeford Avenue, left the motorcyclist, James Busterna, with the fractures and internal injuries at Stony Brook University Medical Center, where he was flown by police helicopter, authorities said.

The crash happened when the Jeep driver, who had a stop sign, hit the 2006 Harley Davidson being driven by Busterna; the Jeep driver said he hadn't seen the motorcycle before the crash, the First Squad's Det. Sgt. Daniel Murphy said Saturday night.

The passenger riding with Busterna, 48, of Greenlawn, was Debbie Lizza, 48, of Melville. She is at Good Samaritan Hospital Medical Center, police said.

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The Jeep's driver, Matthew Trenn, 23, of Wantagh, and his passenger, Katherine Onorato, 22, of North Babylon, were treated and released Saturday for minor injuries at Good Samaritan.

No criminal charges have been filed in the case, Murphy said.