VIENNA, Sept 18: The International Atomic Energy Agency called on Iran on Saturday to immediately halt activities related to uranium enrichment, a process that can be used to make atomic weapons.

The resolution also called on Iran to grant full and prompt access to IAEA inspectors and provide them with any further information needed before the next IAEA meeting on Nov 25.

The resolution said Iran must suspend all "enrichment-related activities" and said the agency's governing board regretted Tehran's suspension of enrichment as promised last year had fallen far short of what had been expected.

France, Britain and Germany co-sponsored the toughly worded resolution, which was unanimously adopted by the IAEA's board of governors after a week of closed-door haggling over the wording.

The United States failed to get the Europeans to report Iran to the UN Security Council, or even include a "trigger" clause for a report in November. But it fully endorsed the resolution.

"The clock is now ticking on Iran to fully comply with the resolution and abandon its nuclear weapons programme or face referral to the UN Security Council," US Energy Secretary Spencer Abraham said a statement.

The IAEA has been investigating Iran's nuclear programme for two years. Although it says it has found many concealed activities that could be used to develop weapons, it has found no "smoking gun" that would prove US allegations of Iranian bomb plans.

"The board has sent a very powerful message to Iran," IAEA chief Mohamed ElBaradei told reporters.

German Foreign Minister Joschka Fischer said it was "most important that Iran suspends all activities regarding enrichment".

NO LEGAL OBLIGATION: Iran's chief delegate Hossein Mousavian said his country did not have to comply with the demand, since the resolution distinguished between legal obligations and voluntary actions aimed at building confidence like the enrichment freeze.