A whistleblower has made a series of extraordinary claims about how corrupt government officials allowed Pakistan and other states to steal nuclear weapons secrets. Sibel Edmonds, a 37-year-old former Turkish-language translator for the FBI, listened into hundreds of sensitive intercepted conversations while based at the agency's Washington field office. Edmonds described how foreign intelligence agents had enlisted the support of US officials to acquire a network of moles in sensitive military and nuclear institutions. Among the hours of covert tape recordings, she says she heard evidence that one well-known senior official in the US State Department was being paid by Turkish agents in Washington who were selling the information on to black market buyers, including Pakistan. The name of the official - who has held a series of top government posts - is known to The Sunday Times. He strongly denies the claims. However, Edmonds said: He was aiding foreign operatives against US interests by passing them highly classified information, not only from the State Department but also from the Pentagon, in exchange for money, position and political objectives." She claims that the FBI was also gathering evidence against senior Pentagon officials - including household names - who were aiding foreign agents. "If you made public all the information that the FBI have on this case, you will see very high-level people going through criminal trials," she said. Her story shows just how much the West was infiltrated by foreign states seeking nuclear secrets. It illustrates how western government officials turned a blind eye to, or were even helping, countries such as Pakistan acquire bomb technology.