Suffolk police Sgt. Michael Guerrisi was off-duty and on his personal boat when he saw the 33-foot Sea Ray Sundancer on fire in Port Jefferson Harbor at about 12:50 p.m., Suffolk police said.
Guerrisi pulled four people who were in the water onto his personal boat after they abandoned their burning vessel, police said in a release.
The Port Jefferson Fire Department responded to the scene at 12:50 p.m., officials said.
Port Jefferson Second Assistant Fire Chief Anthony Barton said the boat was “free standing” near the docking area when the fire started.
The Sundancer's owner, Charles Schwartz, 59, of Greenwich, Connecticut, and Ainsley Lothrop, 30, of Norwalk, Connecticut, were taken to Stony Brook University Hospital for evaluation. David Lamontagne, 47, of Norwalk, and Robert Corbi, 31, of Greenwich, were taken there with nonlife-threatening injuries.
The fire is under investigation by the Suffolk County Arson Squad.
Port Jefferson Fire Chief Brennan Homes told News 12 his department was notified about the fire by a Lake Grove fire marshal who was on the docks at the time.