(AP) — Firefighters are investigating a fire that killed an infant girl in western Iowa.

6-month-old Mayci Colburn-Lerette was killed in the fire in Council Bluffs around 8 p.m. Saturday.

Three other family members were critically injured by smoke inhalation and taken to Creighton University Medical Center in Omaha. They are 30-year-old Jeremiah Lerette, 70-year-old Terese Lerette and 2-year-old Gerard Lerette.

Assistant Council Bluffs Fire Chief Justin James says the fire started on the first floor of the home.

Authorities will investigate the fire to determine what may have caused it.