Tens of thousands told to evacuate after a 34,000-gallon tank of methyl methacrylate leaked at an aerospace plastics facility, sending potentially toxic vapors into the air.

The risk of a catastrophic explosion at a damaged chemical tank in Southern California has been eliminated following a close overnight inspection that confirmed a crack in the tank relieved pressure a...

Firefighters celebrated the appearance of a crack in the tank over the weekend, which helped relieve pressure, and the tank had cooled slightly.