Firefighters were battling an industrial building fire in Santa Fe Springs that was sending thick smoke into the sky Wednesday.
The blaze began burning around 5 p.m. in the 9600 block of John Street, which crosses Los Nietos Road. Officials said there may be titanium in the blaze.
The roof had partially collapsed.
A pile of rubbish in the yard area had also been on fire, as firefighters worked to control the blaze.
It wasn't immediately clear what started the fire.