California chemical tank explosion threat eases

The failing chemical tank in Southern California that caused tens of thousands of people to evacuate is no longer presenting a threat of major explosion, officials say.

1. Frame 1Garden Grove, Orange County: a damaged GKN Aerospace tank cooled after days of explosion fears.
2. Frame 2Night crews checked temperatures while the tank was less dangerous to approach.
3. Frame 3A crack vented pressure and helped the chemical cool, officials said.
4. Frame 4OCFA said the worst-case BLEVE fireball threat was off the table.
5. Frame 5About 50,000 residents remained under evacuation orders while crews watched for leaks.
6. Frame 6The open question: how much chemical has solidified, and when neighborhoods can return.