Private security firm accused of overbilling in Afghanistan.

U.S. Protection and Investigations, a private security firm working for the State Department in Afghanistan, “is accused of overbilling the U.S. government by charging for nonexistent employees and vehicles.” The overbilling “could add up to millions of dollars,” an American security official with close ties to the company told the AP. Company computers and office files were seized last month after agents of Blackwater USA, another contractor steeped in controversy, raided USPI’s Kabul office.