SIDNEY - The Fremont County Sheriff's Office responded with fire crews from Sidney, Hamburg and Riverton to a house fire Sunday night.

The owners of a home on the 1000 block of Filmore Street in Sidney were not at home at the time of the fire around 9 p.m., but two dogs inside of the home were killed by smoke inhalation.

A sheriff's office press release says bystanders advised they observed smoke coming from the house and gained entry in an attempt to save the dogs, but were unsuccessful.

The sheriff's office reported Monday morning that the cause of the fire is unknown.