Potential crack on California toxic chemical tank could be easing pressure as officials race to prevent explosion

A potential crack may be releasing pressure inside a toxic chemical tank in Garden Grove, officials said Sunday, a development they hope could help avert a devastating vapor explosion.

LA PALMA, Calif. — A potential crack may be releasing pressure inside a toxic chemical tank in Southern California, officials said Sunday, a development they hope could help avert a devastating vapor explosion.

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The tank holds methyl methacrylate, a toxic chemical used to manufacture resins and plastics.

Concerns over a possible explosion or leak have prompted evacuation orders for tens of thousands of residents, many of whom are staying in shelters.