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VIENNA — Iran has amassed more than two tons of enriched uranium, the U.N. atomic agency said Monday in a report that heightened Western concerns about the country developing the ability to produce a nuclear weapon.

Two tons of uranium would be enough for two nuclear warheads, although Iran says it does not want weapons and is only pursuing civilian nuclear energy.

The U.S. and the four other permanent U.N. Security Council members — Russia, China, Britain and France — have tentatively backed a draft fourth set of U.N. sanctions against Iran over its refusal to stop enriching uranium.

Separately, the International Atomic Energy Agency — the U.N. nuclear watchdog — said Syria continues to stonewall agency reports to follow up on U.S. assertions that a facility destroyed three years ago by Israeli warplanes was a secretly built reactor meant to produce plutonium.

"Syria has not cooperated with the agency since June 2008" on most aspects of its investigation, according to the IAEA's Syria report. But it noted that Syria has admitted to small-scale nuclear experiments that it had previously not owned up to.

Syria denies allegations it was being helped by Iran and North Korea in developing a covert program.

But diplomats familiar with the Syria probe told The Associated Press of a visit to Syria in January by a high-ranking Iranian nuclear delegation led by Mahdi Kaniki, a deputy to Ali Akhbar Salehi, an Iranian deputy presid... >>>