There still was a small explosion concern and spill potential, officials said, as evacuation orders were lowered from around 60,000 to 16,000 people.

LOS ANGELES, May 23 — Tens of thousands of people were ordered to leave their homes in California yesterday after a huge chemical tank began leaking, with warnings it might blow...

Thousands evacuated in Southern California as officials manage a failing chemical tank to prevent potential leaks or explosions.