Talks between Iran and the United States over Tehran’s rapidly advancing nuclear program are “in a very crucial” stage.

Iran’s newly-elected president has reappointed a U.S.-educated official as director of the country’s nuclear department.

Iran and the United Nations’ nuclear watchdog are still negotiating over how to implement a deal struck last year to expand inspections of the Islamic Republic’s rapidly advancing atomic program.

Iran says it gave new details to the U.N. about two sites near Tehran that inspectors say bore traces of manmade uranium.

The head of the United Nations’ nuclear watchdog says he met with his Iranian counterpart in Vienna for talks about an ongoing investigation into manmade uranium particles found at undeclared sites in Iran.

Tehran and the United Nations' nuclear agency say that Iran has agreed to supply answers long sought by the United Nations’ nuclear watchdog as talks in Vienna over its tattered atomic deal with world powers appear to be coming to an end.

The head of Iran’s civilian nuclear program says Tehran will allow U.N. inspectors to install new memory cards into surveillance cameras at its sensitive atomic sites and to continue filming there.