A report by the UN nuclear agency says Iran has failed to address suspicions it may have conducted explosives tests and other activity that could be used to develop a nuclear bomb.
The report by the International Atomic Energy Agency was issued to IAEA member states in Vienna on November 7.
On a positive note, the report says Tehran has not boosted uranium enrichment and has not installed any significant components at its plutonium-producing reactor in Arak.
The document was issued ahead of a self-imposed November 24 deadline for Iran and six global powers to end a decade-old standoff over the Islamic Republic's nuclear activities.
Western powers say no final agreement will be reached until the IAEA issues a ruling saying it is satisfied with its inquiry.