HAYWARD, Calif. -- At least six people were taken to the hospital Thursday morning after a massive explosion caused a large fire in Hayward, California, fire officials say.

The Alameda County Fire Department says crews responded to the three-alarm fire. Eight engines and two trucks were on scene. It happened around 9:30 a.m., just hours after a construction crew damaged a gas line.

Fire officials believe two of the six people injured were workers in the street. The conditions of all the people taken to the hospital are unknown.

Dramatic footage captured by a home's Ring doorbell camera shows a massive explosion rocking a large building across the street.

"We were sitting in the house and it just ... everything shook. Stuff fell off the walls. And when we looked at the camera, it was l

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