Authorities — scrambling to find a safe resolution after a tank containing a hazardous chemical at a Southern California aerospace plant was damaged — believe the risk of a catastrophic explosion has been eliminated. But the evacuation order affecting tens of thousands of residents remains.

Chemical tank leak in Garden Grove forces 40,000 evacuations as crews race to prevent a possible explosion at a Southern California aerospace plastics plant.

About 40,000 residents evacuated after a chemical tank failure at a Garden Grove aerospace facility triggered safety concerns.