A coroner says the three people found dead on an Indian reservation were teenage girls.

The bodies were found in a Wind River Indian Reservation home Wednesday morning. The girls were ages 13, 14 and 15 but their identities have not been released.

Fremont County Coroner Ed McAuslan said Thursday that authorities aren't yet releasing information on the causes of death. He wouldn't say whether there was any trauma to the bodies or other signs of foul play.

The FBI and Bureau of Indian Affairs police are investigating.

A spokeswoman for the FBI in Denver wasn't immediately available for comment Thursday morning.