PARIS: The International Atomic Energy Agency, in an unusually blunt and detailed report, said Monday that Iran's suspected research into the development of nuclear weapons remains 'a matter of serious concern' and continues to need 'substantial explanations.'

The nine-page report accused the Iranians of a willful lack of cooperation, particularly in answering allegations that its nuclear program may be pointed less at energy generation than at military use.

Part of the agency's case hinges on 18 documents listed in the report and presented to Iran that, according to Western intelligence agencies, indicate the Iranians have ventured into explosives, uranium processing and a missile warhead design — activities that ordinarily would be associated with constructing nuclear weapons.

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