Two diplomats say Iran and the U.N. nuclear agency have agreed to mid-May talks focused on restarting a probe of suspicions that Tehran has worked secretly on atomic arms.

Their last meeting in February extended a string of inconclusive attempts by the International Atomic Energy Agency to re-launch investigations stalled for more than five years.

Tehran says IAEA suspicions are based on phony U.S. and Israeli intelligence. It also dismisses concerns that its uranium enrichment program is meant to make bombs, insisting the aim is to generate power.

Iran has said it will not agree to cooperate with an IAEA probe as long as demands that it has a right to enrich are not recognized.

The diplomats demanded anonymity Thursday because they are not allowed to disclose IAEA information.