A 15-year-old West Islip boy was in critical condition after police said he was struck by a sport utility vehicle while riding his bicycle Tuesday evening on Udall Road, Suffolk County police said.

Police said the boy, identified as Thomas Labetti, suffered "severe internal injuries" in the crash, which occurred at 7:38 p.m. on southbound Udall. Labetti was taken by West Islip Fire Department Rescue Ambulance to Good Samaritan Hospital Medical Center in West Islip.

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Police said Dennis A. Grabhorn Jr., 34, of Peter Paul Drive, driver of the 2006 Chevrolet Tahoe that struck Labetti, was not injured in the crash. He was not charged.

Police said the investigation into the cause of the accident is continuing and that the vehicle was impounded for a safety check. Anyone with information about the accident is asked to call Third Squad detectives at 631-854-8352. All calls will remain confidential.