Crews are hosing down a chemical storage tank for a second day in Southern California. Officials fear a spill of the toxic chemicals used to make plastics or an explosion.

The exact nature of the damage, and what contingencies are in place to deal with it, have not been made clear.

If the failing chemical tank in Orange County does explode, the aerospace plant where it sits and dozens of homes surrounding it could suffer severe damage, according to a map released by authorities Saturday.

Two people were injured in an explosion and fire at a chemical plant in Ottawa, Illinois.

MMA is known to be an irritant, particularly for the lungs and heart, but it is not currently a known carcinogen in humans.

40,000 people remain evacuated while crews put themselves ‘in harm’s way’ to try to avert disaster, official says.