UPDATE: Girl, 4, killed in fire at suburban Denver group home

Authorities say a 4-year-old girl was one of two people killed in a fire at a suburban Denver group home.

Jefferson County Deputy Coroner John Cline said Sunday the girl and a 39-year-old woman died in the Saturday morning blaze in Arvada. KMGH-TVreports the building was a host home for the developmentally disabled.

Cline says autopsies were being performed Sunday. He would not release the names of the dead because their families have not been notified.

Four other people were transported to hospitals for treatment. Authorities say firefighters found heavy smoke billowing from the front of the home when they arrived.

Investigators have not determined the cause or origin of the fire.