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The head of the United Nations mission in Colombia, Jean Arnault, says he's optimistic that Farc rebels will hand over their weapons by the end of May, in spite of delays to the disarmament process. Mr Arnault told Newsday's Julian Keane there had been some problems, but the process had now started.

(Photo: Farc guerillas member holds a rifle. Credits: Raul Arboleda/AFP/Getty Images)