RIVERTON, Wyo. (AP) — Authorities say a pack of dogs attacked and killed a woman on an American Indian reservation in central Wyoming.

Mark Stratmoen, chief deputy Fremont County coroner, said in statement Monday that 40-year-old Deanne Lynn Coando (CO-Ando) died last week at a hospital in the city of Riverton.

Preliminary autopsy results show Coando died of hypothermia and loss of blood from serious injuries she suffered Wednesday when multiple dogs attacked her on the Wind River Indian Reservation south of Riverton. Stratmoen says no one witnessed the attack.

Officials are urging the public to watch for any aggressive dogs. They're encouraging residents to report problems to a law enforcement agency.

Stratmoen says Coando, of Ft. Washakie, was a member of the Eastern Shoshone Tribe.