Map shows potential blast zones
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The situation took a significant turn for the worse on Friday, with officials saying the tank had two options: fail or explode.
Tens of thousands told to evacuate after a 34,000-gallon tank of methyl methacrylate leaked at an aerospace plastics facility, sending potentially toxic vapors into the air.
Residents and businesses were evacuated for a second time after a vapor release from a tank containing an industrial chemical.