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SAVANNAH, Ga. (AP) -- A federal prosecutor says the Justice Department won't seek criminal charges against executives or employees of Imperial Sugar five years after an explosion killed 14 workers at the company's refinery near Savannah.

Edward Tarver, U.S. attorney for the Southern District of Georgia, said in statement Tuesday a lengthy review found "insufficient evidence of intentional disregard or plain indifference" to safety regulations to prosecute anyone in the Feb. 7, 2008, explosion.

Investigators determined the blast was caused by sugar dust that ignited like gunpowder. Fourteen workers died and 36 more were injured.

In 2010, Imperial Sugar agreed to pay more than $6 million in fines for safety violations at plants in Georgia and Louisiana. The company was bought by Louis Dreyfus Commodities Sugar Holdings LLC in a merger last June.

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