Deadly Cle Elum house fire investigation continues

CLE ELUM, Wash. -- Investigators don't yet know what caused the house fire that killed two young boys in Cle Elum last Friday.

They'll go back there on Wednesday to take another look.

The children were three and four years old. They were trapped inside the home on 3rd Street when the fire started.

Police said their mother and a friend made it out alive. Investigators said the mother was taken to a hospital with burns.