WILTON — The cause of a fire that destroyed a house at 145 Weld Road on Monday remain undetermined because of the level of destruction, Fire Rescue Chief Sonny Dunham said Thursday.

Rose Bernard and her four children lost their belongings and the home they rented.

Firefighters from several towns responded to the fire that was already fully engulfed in flames when it was reported at 11:40 a.m., near the intersection with Doak Street and near the Town Office.

A state fire investigator reviewed the scene Monday.

Bernard and the children were not home at the time the fire started. She had no rental insurance for her belongings, Dunham previously said.

The property is owned by John Studley of Brockton, Massachusetts. The house was insured.