An Islip Terrace man was arrested Thursday after he fled the scene of a hit-and-run crash that left an 18-year-old pedestrian seriously injured in Bay Shore, Suffolk County police said.

The victim, identified by police as James Vaughn of Bay Shore, was crossing Fifth Avenue at Howells Road when he was struck by a 1998 Ford pickup truck about 4 p.m.

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He was taken to Southside Hospital in Bay Shore with what police described as "a serious head injury" and broken bones. Police said he was listed in stable condition Friday.

After the crash, police said a Third Precinct officer managed to locate the pickup and arrest driver Alfred Buckman, 51, of 14 Lorigan St. He was charged with leaving the scene of a motor vehicle crash involving serious physical injury without reporting, second-degree aggravated unlicensed operation of a motor vehicle, two counts of failing to stop at a steady red signal and having an uninsured, unregistered and uninspected vehicle.

Buckman was arraigned Friday in First District Court in Central Islip and held pending a bail of $25,000 cash or $75,000 bond.

His attorney, Ira Weissman of Central Islip, said Buckman has been reflecting on what happened: "He just expressed what I saw as sincere concern for the boy."

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Police said the investigation is continuing and ask anyone with information to call Third Squad detectives at 631-854-8352 or Crime Stoppers at 800-220-TIPS. All calls will remain confidential.