U.N. inspectors later said the documents were old and irrelevant -- some administrative material , some from a failed and well-known uranium-enrichment program of the 1980s .
They said some of the documents were administrative paper work and some about a failed and well-known uranium-enrichment program of the 1980s .
But a source close to the Pentagon said the Defense Department 's own inspector-general had been asked to investigate how the licences were awarded .