The US and five other powers insist that Tehran must fully cooperate with the UN's International Atomic Energy Agency's probe for any nuclear agreement that grants Iran total sanctions relief.
"Iran has not provided any explanations" on the suspicions, according to a confidential report obtained by The Associated Press.
The agency also said that Iran is honoring commitments to put temporary restraints on its atomic activities as it negotiates on the long-term nuclear deal.
Diplomats have told the AP that Washington is willing to extend the IAEA investigation, if an agreement is reached by June that constrains Iran's uranium enrichment program and other activities that could be turned to making nuclear arms.
They say the US would set a time limit on such an extension and keep some sanctions on Tehran in place until the IAEA delivers its ruling.
With Tehran showing no signs that it is ready to cooperate, the international community might have to settle longer term for an IAEA assessment based only on American, Israeli and other intelligence and its own information gathering.
A senior diplomat said IAEA chief Yukiya Amano planned to meet next week with Iranian Deputy Foreign Minister Abbas Araghchi in hopes of advancing the talks. He demanded anonymity because he is not authorised to divulge the information.
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