US Defence Secretary Robert Gates has ordered a review of the way private security firms operate in Iraq and the oversight given by the US military. The move follows an incident earlier this month involving US security firm Blackwater, in which 11 Iraqis died. The Iraqi government reacted by briefly suspending the firm, and drafting new laws regulating private security...Mr Gates said that his concern was "whether there has been sufficient accountability and oversight" of contractors...A US-Iraqi panel is already investigating the shooting...Blackwater USA has said its guards reacted lawfully to an attack on a US diplomatic convoy.