SAN FRANCISCO (KRON) - Investigators expect to have a preliminary report on the San Francisco gas line explosion within the next two weeks.
The National Transportation Safety Board (NTSB) is looking into the explosion that happened on Wednesday in the Inner Richmond District.
They returned to the scene Saturday where a flame shot 40 feet into the air for more than two hours.
"[We] have focused on the need to rapidly shutdown a pipeline since 1970. We've had a number of recommendations," said NTSB board member, Jennifer Homendy. "We've issued a number of studies on the need to shutdown the flow of gas and hazardous liquid quickly to minimize impact."
The San Franciso Fire Department determined the explosion accidental, however the Federal Bureau of Investigations, California Public Utilities Commission and the California Occupational Safety and Health Administration are also looking into it.
Homendy says, "We also visited PG&E's pipeline control center in San Ramon where we were able to see what the pipeline controllers can see on their screen."
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