LITITZ, Pa. - Production at a Lancaster County chocolate plant is shut down while federal officials look into a possible case of product tampering.

A representative for Cargill Inc. says three pieces of "foreign material" were discovered at the Wilbur Chocolate plant in Lititz, and the FBI and the Food and Drug Administration are investigating.

The plant may not reopen for several weeks. Only one-third of the employees will report to work and they will be cleaning the plant.

The representative would not say what kind of foreign material was found.

The workers' union has been trying to reach a contract agreement for more than two years. A representative says only that the two sides are negotiating in good faith.

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Information from: WGAL-TV, http://www.wgal.com