Iraq should tightly regulate private security firms to prevent abuses by their employees when they stay on in the country after a scheduled U.S. military withdrawal, a U.N. working group said...the U.S. State Department plans to use more than 5,000 private security contractors to protect the civilian-led U.S. mission that will support Iraq's reconstruction after 2011...A...U.S.-Iraqi agreement contained a provision removing the immunity of some private foreign security contractors, but [Jose Luis Gomez del Prado, Chair of the United Nations Working Group on the use of mercenaries] said this did not address the issue of justice for victims of rights abuses committed by contractors. [refers to Blackwater]