Arson Squad investigators are trying to determine the cause of a fire that gutted a gas station convenience store and car wash early Monday in Brightwaters that saw one firefighter taken to a local hospital suffering from heat exhaustion, Suffolk County police and fire officials said.

The fire occurred at 2:30 a.m. at the station on Howells Road and Ackerson Boulevard, adjacent to the Peter Pan Diner on a triangle also bordered by the Sunrise Highway service road.

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Officials said firefighters from Bay Shore, Brentwood, West Islip and Islip responded to the scene to find the building “fully engulfed” by fire. A Bay Shore-Brightwaters Ambulance crew also responded, transporting the injured firefighter.

Officials said it took about an hour for firefighters to bring the blaze under control.

Fire officials said an accelerant-sniffing dog also was dispatched to the scene.