Federal safety investigators cited three Amazon warehouses for putting workers at serious risk of injury from the bending, twisting and lifting required to rapidly move and stack packages for hours, AP reports.

Amazon rejected the findings by the Occupational Safety and Health Administration, and said it would appeal.

OSHA announced the citations Wednesday at warehouses in Florida, Illinois and New York, which were inspected as part of an ongoing investigation into Amazon’s safety practices in conjunction with the U.S. Attorney’s Office for the Southern District of New York.

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