VIENNA - Lack of progress in talks between Iran and the International Atomic Energy Agency is disappointing and it shows Tehran's continued failure to abide by its commitment to the UN nuclear watchdog, a US envoy said on Saturday.

The IAEA and Iran failed at talks on Friday to unblock an investigation into suspected atom bomb research by the Islamic state, a setback dimming any chances for success in higher-level negotiations between Tehran and major powers later this month.

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