International Atomic Energy Agency chief Mohamed ElBaradei has been formally re-appointed to the post for another four-year term.
Mr. ElBaradei, who has been the Director General of the U.N. agency since 1997, was unanimously approved and immediately sworn-in Monday at an IAEA general conference in Vienna.
The agency's board of governors had re-nominated him for the post in June after the United States dropped its opposition to a third term for Mr. ElBaradei.
The United States viewed the former Egyptian diplomat as being too soft on Iran's nuclear activities that Washington says are a cover for an atomic weapons program. Iran denies the charge.
Last week, the IAEA board adopted a resolution saying Iran could be referred to the U.N. Security Council for possible sanctions if Tehran fails to meet international concerns about its nuclear program.
Some information for this report provided by AP and AFP.