Hospira Inc said U.S. health regulators raised fresh concerns about the injectable-drugs maker's troubled Rocky Mount, North Carolina manufacturing plant - one of its largest production facilities. Hospira's Rocky Mount facility has been under the FDA scanner since April 2010, when the regulator issued a warning letter stating manufacturing practices at the plant violated its defined standard practices.The company said on Tuesday that the FDA inspected the facility and issued a letter outlining 20 concerns, three of which the agency had expressed earlier. Read the full story here.