ST. AMANT — Smoke detectors installed in a mobile home saved the life Thursday of an 11-year-old sleeping girl endangered by a fire quickly spreading throughout her bedroom, the St. Amant Fire Department chief officer said.

St. Amant firefighters, along with members of the 7th District and Sorrento Volunteer fire departments, arrived at the fire at 11:46 a.m., three minutes after receiving the alarm, to find flames coming out of the girl’s bedroom window, Chief Officer James E. LeBlanc said in a news release.

The older residents had been outside for three minutes when they heard the smoke detectors going off.

The homeowner found the curtains engulfed and the smoke detector in the bedroom alerting the sleeping child, LeBlanc said.

The cause of the fire remains under investigation, but firefighters determined the fire originated in the child’s bedroom, LeBlanc said in a phone interview.

The trailer is considered a loss after extensive smoke damage, and the child’s bedroom received severe fire damage, LeBlanc said. Firefighters had the fire out by 12:15 p.m. and no injuries were reported, LeBlanc said.

The Red Cross was called to help the seven displaced residents find shelter and clothing, LeBlanc said.