The Arak IR-40 heavy water reactor in Iran. Photo: Nanking2012 / WikiCommons.

Reuters- Signs that a U.N. watchdog investigation into suspected atomic bomb research by Iran is making little progress could further complicate broader diplomatic efforts to end the decade-old nuclear dispute that resume in Vienna this week.

The International Atomic Energy Agency indicated after a three-hour meeting with Iran on Monday that more work was needed to fully implement a series of nuclear transparency measures by Tehran by a Thursday deadline. Iran says it has already done so.

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