SAN FRANCISCO -- A gas explosion started a major fire in a San Francisco Bay Area neighborhood on Thursday, damaging several homes and sending heavy smoke into the air. Local outlets said there are possible injuries from the Hayward explosion. A spokesperson with Pacific Gas & Electric Co. said a construction crew damaged an underground gas line around 7:35 a.m. The company said it was not their workers. Utility workers isolated the damaged line and stopped the flow of gas at 9:25 a.m., PG & E said. The explosion occurred shortly afterward.

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