ST. PETERSBURG, FL — The cause of a Sunday morning fatal house fire that left an 18-year-old woman dead on Coquina Key was deemed suspicious and is under investigation, St. Petersburg police said in a news release.

St. Petersburg Fire Rescue responded to the fire in the 3900 block of Neptune Drive SE around 3:30 a.m.

There were four people in the home at the time of the fire, including Angelina Anderson, 18, who died from her injuries, police said.

A 35-year-old woman rescued from the fire remains hospitalized in critical but stable condition, investigators said.

Two minors at the home were treated in the hospital for smoke inhalation and released.