Since 2007, the International Atomic Energy Agency (IAEA) - with the support of the United States, Israel and European allies UK, France and Germany - has been demanding that Iran explain a set of purported internal documents portraying a covert Iranian military program of research and development of nuclear weapons.
The "laptop documents," supposedly obtained from a stolen Iranian computer by an unknown source and given to US intelligence in 2004, include a series of drawings of a missile re-entry vehicle that appears to be an effort to accommodate a nuclear weapon, as well as reports on high explosives testing for what appeared to be a detonator for a nuclear weapon.