LONDONDERRY — Firefighters responded to a fire at 8 John St. in Londonderry on Saturday evening. While the fire was contained to a single upstairs bedroom, water and smoke damage to the rest of the house left it uninhabitable, officials say.

Londonderry Battalion Chief Kevin Zins said the call came in at about 6:20 p.m. and the fire crews got the fire under control by about 7:10 p.m.

Zins said the family that lived in the two-story, single-family colonial evacuated safely. Firefighters located and rescued a cat from the home.

The family is currently staying with family members in town, according to Zins.

One firefighter was injured during operations and was taken to Parkland Medical Center in Derry to be treated for a minor injury, Zins said.

Londonderry fire investigator Brian Johnson said the fire started in one of the children’s bedrooms.

“The cause is undetermined due to the damage and the severity of the damage from the fire,” Johnson said.

Fire crews from Windham, Derry and Hudson assisted Londonderry at the John Street residence, and station coverage was provided by Salem, Litchfield and Nashua, Zins said.