On 6 March 2006, the IAEA Secretariat reported that ""the Agency has not seen indications of diversion of nuclear material to nuclear weapons or other nuclear explosive devices ... however, after three years of intensive verification, there remain uncertainties with regard to both the scope and the nature of Iran's nuclear programme"". However, the inspectors did find some sensitive documents, including instructions and diagrams on how to make uranium into a sphere, which is only necessary to make nuclear weapons. Iran furnished the IAEA with copies, claiming not to have used the information for weapons work, which it had obtained along with other technology and parts in 1987 and the mid-1990s. It is thought this material was sold to them by Abdul Qadeer Khan, though the documents did not have the necessary technical details to actually manufacture a bomb.