Iran's president says his country has put into operation more than 3,000 uranium enrichment centrifuges, reaching a key goal in its nuclear program. 

Mahmoud Ahmadinejad said Sunday Iran is still installing more centrifuges.

Iran's Foreign Ministry also warned Sunday that the country will review its cooperation with the International Atomic Energy Agency if the Security Council passes a third sanctions resolution.

U.N. Security Council members have threatened to impose more sanctions on Iran if it does not freeze its uranium enrichment program.

The United States and its allies accuse Iran of seeking to build nuclear weapons under the cover of a civilian program.  Iran denies the charge.

Iran said it had 3,000 centrifuges up and running earlier this year.  But the U.N. nuclear agency said Iran does not yet have that number in operation.

In a report last week, the Vienna-based IAEA said that once Iran's past nuclear activities have been clarified, the country will need to continue to build confidence about the scope and nature of its present and future nuclear programs.

Iran is reported to have resolved questions with the IAEA about its tests with plutonium.  Highly enriched uranium and plutonium can be used to make nuclear weapons. 

Some information for this report was provided by AFP, Reuters.