Tens of thousands of residents have been evacuated and Gov. Gavin Newsom has declared an emergency as officials try to thwart an explosion at the facility in the city of Garden Grove.

Authorities in Orange County say they’re unable to control the valves on a tank that contains methyl methacrylate, a chemical used in the manufacture of plexiglass.

Officials fear a failing chemical tank holding flammable chemicals is going to spill or explode

Around 40,000 people were ordered to evacuate parts of Southern California after a hazardous chemical leak at an aerospace manufacturing facility in Garden Grove triggered fears…