FILE - An official from Iran's Atomic Energy Organization stands in front of uranium enriching centrifuges at a 2009 an exhibition of Iran's nuclear achievements at Shahid Beheshti University in Tehran.
FILE - An official from Iran's Atomic Energy Organization stands in front of uranium enriching centrifuges at a 2009 an exhibition of Iran's nuclear achievements at Shahid Beheshti University in Tehran.

VIENNA - The U.N. nuclear watchdog said on Friday it had made incremental progress but no breakthrough in its inquiry into whether Iran may have researched an atom bomb, a sobering message that may dim chances for a deal between Tehran and a handful of world powers next month.

Diplomats view Iran's reluctance to open up to investigators from the International Atomic Energy Agency as a sign of its reluctance to cooperate fully until punitive sanctions imposed on it are lifted as part of any settlement with the powers.

A confidential, quarterly report issued by the IAEA said the Islamic Republic had provided some information about one of two open items in the investigation into possible military dimensions to its nuclear energy program

"The Agency and Iran agreed to continue the dialogue on these practical measures and to meet again in the near future," said the report, which was obtained by Reuters.

A diplomat familiar with the IAEA's update played down the development. He described as "useful" and "relevant" the information Iran had provided on computer modeling that might be used in bomb research – but said it didn’t go far enough.

"It is a positive sign but it is limited because it is only some information. I wouldn't be drawing any major conclusions yet," the diplomat said, adding that progress on the issue had slowed.

The IAEA report was issued to the U.N. agency's member states, with Tehran and six world powers striving to nail down final terms of an accord on curbing its disputed nuclear program in exchange for relief from sanctions crippling the OPEC member country's oil-based economy.

Iran and the six countries known as the P5+1 – the United States, Britain, China, France, Germany and Russia – have given themselves a June 30 deadline. But that shows signs of slipping.

Timing of sanctions relief disputed

Among the issues holding up a settlement is Iran's demand that sanctions be rescinded immediately after a deal is clinched against the powers' insistence they can be lifted only in phases depending on Tehran's compliance with the terms.

The Vienna-based IAEA also said it remained vital that Iran respond to the agency's questions on and access to the Parchin military base, where Western officials suspect Tehran conducted explosives tests relevant to nuclear bombs.

The Islamic Republic denies this and has long maintained that it is enriching uranium only for electricity and medical isotopes rather than to develop a nuclear bomb capability in secret, as the West has suspected.

The IAEA "remains ready to accelerate the resolution of all outstanding issues under the Framework for Cooperation," the report said. "This can be realized by increased cooperation by Iran and by the timely provision of access to all relevant information, documentation, sites, material and personnel in Iran as requested by the agency."

File- U.S. Secretary of State John Kerry, left, an
US Secretary of State John Kerry, left, and Iranian Foreign Minister Javad Zarif arrive to deliver a statement, at the Swiss Federal Institute of Technology, or Ecole Polytechnique Federale De Lausanne, in Lausanne, Switzerland, Thursday, April 2, 2015.

Deadline approaches

The United States said it is not considering negotiating beyond the deadline despite indications from France and Iran that there’s some room to do so.

U.S. Secretary of State John Kerry is to reconvene with his Iranian counterpart, Mohammed Javad Zarif, in Geneva on Saturday. The lead U.S. negotiator, Wendy Sherman, flew to Vienna on Wednesday for talks among Iran and the powers and will join Kerry in Geneva before resuming talks in the Austrian capital.

The world powers seek a deal in which Iran would accept limits to its uranium enrichment capacity and open up to unfettered IAEA inspections to help ensure it could not put its nuclear program to developing bombs. They also want Iran to resolve all IAEA questions to build trust in its nuclear aspirations.

A tentative agreement was reached April 2 between Iran and the world powers.

But pivotal issues remain unresolved, including the pace of easing Western sanctions and the extent of monitoring and verification measures to ensure Iran honors any agreement.

Iran has ruled out any nuclear inspector access to its military bases, a position rejected by the Western powers. 

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