"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.
The sprawling refinery, which is located just south of Los Angeles International Airport, has its own fire department on site, according to its website. Chevron's firefighters were joined by emergency personnel from El Segundo and Manhattan Beach in responding to the "isolated" fire within the facility, the Chevron spokesperson said.
"LAFD stands at the ready to assist with any mutual aid request. There is no known impact to LAX at this time," Bass said on social media. "We will continue to monitor this situation."
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 media post, the alert system said, "There is NO PUBLIC threat at this time and NO evacuation orders in place at this time."
The fire department in nearby Torrance, California, issued an alert, saying it was aware of the fire, but there was "no impact" to the city.
This is a developing story. Please check back for updates.
ABC News' Naomi Vanderlip contributed to this report.
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