NAPLES, ME (AP) — The Cumberland County Sheriff’s Office says a single-car crash in Naples killed a 17-year-old Massachusetts boy and injured his 15-year-old brother.

It happened around 11 p.m. Friday. Sheriff’s officials say the car failed to negotiate a curve on Harrison Road and struck a tree at a high rate of speed.

Officials say the driver, Joshua Bonnell of Haverhill, Mass., was pronounced dead at the scene. He wasn’t wearing a seatbelt. His younger brother, Austin, was partially ejected from the vehicle but had to be extricated. He suffered two broken legs and a concussion.

The crash remains under investigation. Sheriff’s officials say a preliminary investigation has found that speed, but not alcohol, was a factor in the crash.