A massive fire broke out at a Chevron oil refinery near Los Angeles on Thursday night, sending a towering fireball into the sky and prompting authorities to issue shelter-in-place orders for nearby residents.

Witnesses reported hearing a loud explosion followed by a deep, roaring sound as flames engulfed parts of the refinery. Videos shared on social media captured the dramatic moment the fireball erupted, lighting up the night sky across several neighborhoods.

Emergency crews and firefighters quickly responded to the scene, working to contain the blaze and prevent it from spreading to adjacent facilities. As of early reports, there were no confirmed injuries or fatalities, though officials urged caution as air quality monitoring teams assessed the surrounding area.

Chevron has not yet released an official statement on the cause of the explosion. Investigators are expected to determine whether equipment malfunction or other operational issues were involved.