A motorcyclist suffered serious injuries Sunday night when he crashed with a car along Portion Road in Holbrook, Suffolk County police said.

Law enforcement officials had few details about the accident, saying only that the vehicles collided at 7:43 p.m.

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The cause of the accident was not known -- and the names of the parties involved were not made public.

A spokeswoman for the department said the motorcyclist was taken by ambulance to Stony Brook University Hospital.