AUSTIN, Texas — Authorities have identified the three children that died in a Southeast Austin apartment fire last week as children ranging in age from 5 to 10 years old.

Anyah Lucero, 10, Athena Lucero, 7, and Jeremy Lucero, 5, died in the March 11 fire at a townhome in the Burl North Apartments at 2507 Burleson Road, Austin police said.

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Investigators with the Austin Fire Department’s arson unit, Austin Police homicide detectives, and the federal Bureau of Alcohol, Tobacco, Firearms and Explosives combed through the scene and conducted interviews but were unable to determine what caused the fire, officials said.

Authorities said the death does not appear to be criminal in nature and is not being investigated as a homicide.

Firefighters were called to the complex just before 1 a.m. and contained the fire to the unit where it started before it could spread. Two adults and another child were transported to local hospitals.

The arson and death investigations are ongoing.