VINALHAVEN, Maine — A 3-year-old island girl was flown to a mainland hospital Monday morning after the truck she was in burst into flames.

Fire Chief Mark Candage said the truck fire at 41 Roberts Cemetery Road was reported at 8:59 a.m. and fire and rescue personnel arrived at the scene within five minutes. Roberts Cemetery Road is about three miles from the fire station, Candage said.

Candage said that the 2005 Ford F-350 pickup truck was engulfed in flames when firefighters arrived and that the girl had already been removed.

She was taken to the island airstrip by Vinalhaven Ambulance and flown to Knox County Regional Airport in Owls Head by Penobscot Island Air. The plane was met at the airport by Rockland Emergency Services and the girl was then taken to Penobscot Bay Medical Center in Rockport. A hospital spokesman said Monday afternoon that the girl was admitted in fair condition.

Candage said the girl’s parents, whom he declined to identify, had stopped the truck to feed their horses and left the girl inside because of the cold. The parents kept an eye on the truck while doing their chores and, at one point, the girl’s stepfather turned and noticed the cab had filled with smoke. He ran to the truck and removed the girl.

Candage said an investigator from the state Fire Marshal’s Office was called in and examined the destroyed truck and left the island later that afternoon. Chief Candage did not know the cause of the fire.

“It’s still under investigation,” he said Monday.