The UN's nuclear watchdog says its report on whether Iran has in the past carried out work related to nuclear weapons will not make a clear-cut conclusion.
The UN's International Atomic Energy Agency (IAEA) is wrapping up a more than a decade-long probe of alleged nuclear weapons work by Iran.
IAEA chief Yukiya Amano said the report, due to be released next week, will not be “black and white."
Amano, speaking to reporters outside a meeting of the IAEA's 35-nation board on November 26, described his report as a "jigsaw puzzle" for which his agency only had "pieces."
The report will help determine whether Iran gets relief from sanctions in exchange for scaling back its nuclear activities under an agreement Tehran signed with six world powers in July.
Western powers suspect Tehran did carry out nuclear weapons work, a claim denied by Iran.