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An investigation is continuing into a fire sparked by the explosion of a tank at the Diamond Green Biodiesel plant in Norco, LA.

While the explosion rattled windows miles away, there were no injuries in the Sunday night blast and fire, and parish officials say no protective actions were necessary. Soon after the blast, St. Charles Parish officials gave the all-clear signal.

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There was no word Monday on the cause of the explosion. However, the production unit involved has been shut down, a parish official said.

Air monitoring crews in the area detected no unusual readings, parish spokeswoman Renee Simpson said. There are no road closures, she said.

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The plant is a joint venture of Diamond Alternative Energy LLC, a subsidiary Valero Energy Corp., and Darling International Inc. The plant processes recycled animal fat, used cooking oil and other feedstocks into renewable diesel fuel, the company said.

The refinery employs 40 people, and all personnel ended up accounted for, company spokeswoman Taryn Rogers said. The cause of the fire is under investigation, she said.

The fire did not affect operations at the Valero St. Charles refinery, which shares the same campus, Rogers said.

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