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Refinery Explosions Raise New Warnings About Deadly Chemical

Flames and smoke emerge from the Philadelphia Energy Solutions refinery in Philadelphia on June 21. Experts say the explosions could have been far more devastating if deadly hydrogen fluoride had been released. (AP)
Flames and smoke emerge from the Philadelphia Energy Solutions refinery in Philadelphia on June 21. Experts say the explosions could have been far more devastating if deadly hydrogen fluoride had been released. (AP)

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