NAPLES — A teen driver was killed and his teen passenger was injured when the car in which they were riding hit a tree on Friday night.

The driver, who was not wearing a seat belt, was pronounced dead at the scene, according to the Cumberland County Sheriff’s Office. The passenger was flown by LifeFlight helicopter to Central Maine Medical Center in Lewiston to be treated for serious but non-life-threatening injuries. He was wearing a seatbelt and was partially ejected but had to be cut out of the vehicle.

The car hit a tree after failing to negotiate a turn on Harrison Road shortly after 11 p.m., police said.

The Sun Journal identified the driver as 17-year-old Joshua Bonnell of Massachusetts. The passenger was 15-year-old Austin Bonnell, the newspaper said on its website.

Sheriff’s officials said in a news release that a preliminary investigation found that speed, but not alcohol, was a factor in the crash.