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2250 GMT: The African National Congress released its official reaction saying, "With deep sorrow and a profound sense of loss, the African National Congress received the sad news of the passing of our Isithwalandwe and former President, Comrade Nelson Rolihlahla Mandela. Archbishop Desmond Tutu announced that he will address the media in Cape Town on Friday, December 6 and offered a prayer for South Africa. In Washington, US President Barack Obama mourned Nelson Mandela as a "profoundly good" man who "took history in his hands and bent the arc of the moral universe towards justice." In the UK, former Prime Minister Gordon Brown offered praise for Mandela and reminded people that the accolade he most prized was that of "Children's Champion."