A massive gas explosion rocked an unincorporated neighborhood near Hayward on Thursday, Dec. 11, injuring six people and damaging multiple homes, according to Alameda County fire officials. The blast triggered a three-alarm fire that drew about 75 firefighters to the scene.

Authorities say the explosion occurred shortly after 9:40 a.m., about 10 minutes after crews stopped the flow of gas from two leaks. Pacific Gas and Electric (PG&E) confirmed a construction crew struck an underground gas line earlier that morning while digging on private property. The National Transportation Safety Board is investigating.

Here's what to know about the explosion.

What happened to cause the explosion

Pacific Gas and Electric (PG&E) confirmed that a construction crew struck an underground natural gas l

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