EL SEGUNDO, Calif. -- Firefighters were battling a blaze at a Chevron refinery in Southern California late on Thursday, officials said, after a massive fireball erupted at the facility.

It was not immediately clear what caused the blaze, which was burning in El Segundo, a city in Los Angeles County. It was also not immediately clear if there had been any injuries.

Gov. Gavin Newsom was briefed on the fire, his office said.

"Our office is coordinating in real time with local and state agencies to protect the surrounding community and ensure public safety," the office said in a statement.

A 3-hour shelter-in-place order was issued for areas within the Tree Section of Manhattan Beach, according to Alert SouthBay. "Bring all people and pets indoors," the alert said. In an earlier social m

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