VIENNA, Austria - Iran seems to have at least temporarily halted the uranium-enrichment program at the heart of its standoff with the U.N. Security Council, the head of the International Atomic Energy Agency said Monday.

The pause could represent an attempt to de-escalate Iran’s conflict with the Security Council, which is deliberating a new set of harsher sanctions on the Islamic Republic.

Iran has enriched small quantities of uranium to the low level suitable for nuclear fuel generation. The U.S. and its allies fear that Iran could build nuclear weapons with larger amounts of more highly enriched uranium.

Hard-line President Mahmoud Ahmadinejad had been expected to announce last month that Iran had started installing 3,000 uranium-enriching centrifuges at a facility in the desert outside the central city of Natanz, where it has about 500 centrifuges above and below ground. But the announcement never materialized, an apparent step back that IAEA chief Mohamed ElBaradei appeared to confirm Monday.

“I do not believe that the number of centrifuges has increased, nor do I believe that (new) nuclear material has been introduced to the centrifuges at Natanz,” he said.

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