It was not immediately known what caused the blast in Fresno, which is located between San Francisco and Los Angeles.
Fresno County Sheriff's Office tweeted: "Total of 11 people injured. 3 inmates were taken back to Fresno County Jail & were never hospitalized."
Photographs from the scene showed a huge ball of fire against a clear-blue sky.
The Fresno Fire Department tweeted: "Gas lines are shut down, Fresno Fire continues to monitor atmosphere and patrol the area around grass fire."
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