(WASHINGTON) - European Union foreign policy chief Javier Solana said Friday that he was "worried" by an international watchdog's report that Iran is not cooperating with calls to stop its sensitive nuclear work.

"I am worried (by) the report of the Agency in Vienna," Solana told reporters after the International Atomic Energy Agency (IAEA) issued its report on Wednesday.

Solana, tasked with the United States and five other world powers with presenting proposals to the Iranians to stop uranium enrichment, recalled that it is the second IAEA report to say "they are not cooperating.

"And some of the figures he offers about the quantities, the number of centrifuges, are troublesome," Solana added.

A top diplomat close to the IAEA said Iran was using some 3,800 centrifuges on November 7 and was ready to get 2,200 more working.

The IAEA in a restricted report, a copy of which was obtained by AFP, said that "contrary to the decisions of the (UN) Security Council, Iran has not suspended its enrichment-related activities."

And "as a result of the lack of cooperation by Iran in connection with the alleged studies and other associated key remaining issues of serious concern, the agency has not been able to make substantive progress," it added.

The United States has joined powers China, Russia, Britain, France and Germany in pushing for sanctions against Iran. The Security Council has imposed three sets of sanctions on Tehran over its refusal to halt uranium enrichment.

Washington and western allies say that Tehran's nuclear program is a covert one aimed at building a bomb. Iran denies the charges, saying it is for generating electricity.

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