The 2005 Nobel peace prize has been awarded jointly to the United Nations' International Atomic Energy Agency and its director, Mohamed ElBaradei.
The citation says the IAEA's director is a "fearless advocate" of curbing nuclear arms and the importance of his agency's work "incalculable".
The nuclear watchdog's work to promote safe nuclear energy was also commended.
Mr ElBaradei said the award recognised that the spread of nuclear weapons was the world's worst security threat.
The annual international peace prize, worth $1.29m (£725,000), has been awarded since 1901, after its establishment...