UNITED NATIONS -- The U.N. nuclear chief said Monday that Iran is not cooperating with an investigation into suspected secret work on nuclear weapons.
Yukio Amano told the U.N. General Assembly that talks between the Vienna-based International Atomic Energy Agency and Iran have intensified this year after an IAEA report in November 2011 said it had "credible information that Iran had carried out activities relevant to the development of a nuclear explosive device," he said.
"However, no concrete results have been achieved so far," Amano said.
While the IAEA continues to verify that Iran's declared nuclear material is not being diverted from peaceful purposes, "Iran is not providing the necessary cooperation to enable us to provide credible assurance about the absence of undeclared nuclear material and activities," Amano said.
"Therefore, we cannot conclude that all nuclear material in Iran is in peaceful activities," he said.
But the IAEA director general said "the agency is firmly committed to intensifying dialogue with Iran."
"We will continue negotiations with Iran on a structured approach," he said. "I hope we can reach agreement without further delay."
Iran has repeatedly denied any interest in possessing nuclear arms, but the international community fears that Tehran may turn its peaceful uranium enrichment program toward weapons making -- a concern that is growing as the government expands the number of machines it uses to enrich its stockpile of enriched uranium.
As those fears grow, so does concern that Israel could carry out its threats to attack Iran's nuclear facilities before that nation reaches the bomb-making threshold.
Iran's U.N. Ambassador Mohammad Khazaee reiterated his country's position, that it has a right to develop nuclear energy for peaceful purposes and rejected the claims in the IAEA report saying they are "not credible" and based on "forged reports" provided by Israel and the United States.
In his annual report to the world body, Amano said he also remains "seriously concerned" about North Korea's nuclear program, calling its statements about uranium enrichment activities and the construction of a light water reactor "deeply troubling."
In late 2010, Pyongyang unveiled a uranium enrichment facility that could give North Korea a second route to manufacture nuclear weapons in addition to its plutonium-based program. Earlier this year, satellite images showed that North Korea has made progress in building a light-water reactor to expand its nuclear program.
North Korea is under tough U.N. sanctions, and Amano called on Pyongyang to comply with its obligations under Security Council resolutions and the Nuclear Nonproliferation Treaty, and "to cooperate promptly and fully" with the IAEA.
North Korea's deputy U.N. ambassador Ri Tong Il rejected Amano's report, saying the country is not a party to the treaty, known as the NPT, or a member of the IAEA because the agency is not impartial and has "blindly" sided with the United States.