VIENNA - The UN nuclear watchdog and Iran ended a meeting on Monday without giving statements on the outcome, leaving unclear whether progress was made in efforts to help allay international concern over Tehran's nuclear program.

Under a transparency and cooperation pact agreed between Iran and the International Atomic Energy Agency in November, Iran was to take seven practical measures by May 15 in a phased process, including more IAEA access to nuclear-related sites.

Diplomatic sources told Reuters on Friday that the IAEA was seeking further clarification from Iran about one of those steps, concerning information about fast-acting detonators that can have both military and civilian applications.

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