IAEA reports 'extensive activities' at Iranian plant

The IAEA report said that "extensive activities" at the Parchin military compound - an allusion to suspected Iranian attempts to remove evidence - would seriously undermine an agency investigation into indications that research relevant to developing a nuclear explosive were conducted there.

The IAEA delivered its latest quarterly Iran report 10 days after U.S. President Barack Obama's re-election raised hopes of a revival of nuclear diplomacy with Iran following speculation that Israel might bomb Iranian nuclear facilities.

Iran denies aiming to acquire nuclear weapons, saying its atomic programme is solely for peaceful energy purposes.