UPDATE: Deadly House Fire Investigation in Cle Elum

<p>Courtesy Kittitas Co. Fire Dist. #7</p>

Courtesy Kittitas Co. Fire Dist. #7

New details in the Cle Elum house fire that killed two brothers on November 1st.

The Kittitas County Fire District #7 says the fire started in the children's bedroom on the first floor of the home.

At this time, the cause of the fire is still undetermined until further laboratory analysis is completed.

The fire inside the 3rd Street home killed the boys -- ages 3 and 4.

Their mother suffered non-life threatening burns and was treated at a local hospital.