Updated

United Nations diplomats say that experts monitoring sanctions against Iran reported that an unnamed country noted increased buying by Iran for its heavy-water reactor, which if completed will produce enough plutonium for several nuclear weapons a year.

Two diplomats familiar with the experts report to the Security Council sanctions committee confirmed it includes the accusation that Iran stepped up procurement for the reactor, which is under construction in Arak. They spoke anonymously because the report hasn't been made public.

What to do with the Arak reactor is among disagreements between Iran and the U.S. at talks meant to curb Tehran's nuclear program in exchange for sanctions relief.

The Iranian purchases suggest Tehran isn't heeding U.S. demands to redesign Arak to produce tiny amounts of plutonium.

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Jahn reported from Vienna