SAN JOSE -- A family of three was displaced by a two-alarm blaze that broke out behind a home Monday afternoon and spread into the kitchen, according to fire officials.

The fire was reported just before 1:30 p.m. on the 4000 block of Prunetree Lane, said San Jose fire Capt. Cleo Doss. It started in the back yard, and arriving crews found it had burned through an awning and into the kitchen of the two-story home off Cadwallader Drive.

"They said it was very aggressive," Doss said. "They went into the interior and pushed the fire out of the kitchen. They saved most of the house."

Nobody was home at the time, but crews safely rescued two dogs from the structure, Doss said.

A propane tank attached to a barbecue exploded in the fire, but Doss said that is not believed to be the origin of the blaze.

The fire is under investigation, and a cause was not known Monday evening.

Contact Eric Kurhi at 408-920-5852. Follow him at Twitter.com/erickurhi.