BRONSON, Mich. — Authorities say two children, ages 2 and 5, have died after the camper they were in caught fire in southern Michigan.

The Branch County Sheriff’s Office says the fire started around 10:30 a.m. Monday at a residence in Bronson, about 115 miles southwest of Detroit.

WOOD-TV reports a third child — a 7-year-old — was injured.

Authorities say the three children were alone in the camper, which was a fifth-wheel model, when the fire started. The cause of the blaze is under investigation.

The children’s names haven’t been released. Their relationship to one another wasn’t immediately clear.