(Denver Post) Two Colorado brothers who grew listeria-contaminated cantaloupe linked to a 2011 outbreak that killed 33 people nationwide and sickened hundreds more were criminally charged Thursday by federal authorities.

Eric and Ryan Jensen, charged with six counts of introducing adulterated food into the food supply, turned themselves in to federal marshals and pleaded not guilty on Thursday. They were shackled at the wrists during their federal court hearing.

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