Dole Food Company Inc [DFCI.UL] on Friday said the U.S. Department of Justice is investigating a deadly Listeria monocytogenes outbreak linked to packaged salad products from its processing plant in Springfield, Ohio.

"Dole has recently been contacted by the Department of Justice in connection with its own investigation, and we will be similarly cooperating with the DOJ to answer questions and address any concerns," Dole said in a statement.

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Thirty-three people in the United States and Canada fell ill in the outbreak. Every person was hospitalized and four died.