U.N. nuclear chief Yukiya Amano: Iran inspection deal reached in Tehran, will "be signed quite soon" (CBS/AP) VIENNA - The chief of the U.N. nuclear agency said Tuesday he has reached a deal with Iran on probing suspected work on nuclear weapons, adding that the agreement will "be signed quite soon." Yukiya Amano said some details still need to be worked out. But he told reporters on return from talks in Tehran that Iranian officials say that those will not stand in the way of signing the deal. Amano was in Tehran to resume a long-stalled probe into suspicions that Iran secretly worked on developing nuclear weapons. CBS News correspondent Elizabeth Palmer reports that diplomats are skeptical about the deal. They feel that Amano felt a lot of pressure to reach an agreement with Iran and that he came back from Tehran with a lot less than he should have. The investigation has been stalled for more than four years, with Iran saying it has never carried out such experiments. Iran denies that it is interested in nuclear weapons, saying it wants nuclear power only to generate energy. Given Iran's lack of cooperation in the past, many diplomats will continue to be skeptical until they see actual action from the Iranians, Palmer reports.