Firefighters on Saturday were trying to cool a chemical tank “literally on the edge” of exploding in Garden Grove, California, as they worked to avert a disastrous “worst-case” scenario, the incident’s commander said.

Firefighters trying to prevent an explosion in a tank of hazardous chemicals ⁠in ⁠Southern California found overnight that the failing tank ⁠was heating up internally despite efforts to cool it, the i...

Craig Covey, an incident commander for the Orange County Fire Authority, said in its first public announcement that the responders face two options, both of which threaten the safety of the local comm...