Firefighters responded after hearing explosions early Wednesday behind their Yorba Linda fire house.
Firefighters said they heard the blasts at about 1:30 a.m. They went outside and saw flames shooting out of a house in the 4700 block of School Street, near Lemon Drive.
The residents escaped before flames engulfed their home.
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About 60 firefighters responded to the location. The fire was out in about 40 minutes.
One firefighter was treated for heat-related injuries. No one else was hurt.
The cause of the fire is under investigation.