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The State Department does not know specifically what it received for a billion-dollar contract with security firm DynCorp International to provide training services for Iraqi police, a U.S. watchdog agency said on Tuesday.

The Office of the Special Inspector General for Iraq Reconstruction (SIGIR) said it was forced to suspend its audit of the DynCorp contract after administration officials told investigators they had no confidence in their own accounting records.

The inspector general said the agency had not validated the accuracy of invoices received before October 2006 and described bills and supporting documents as being in disarray.