Ban Ki-moon, the United Nations' secretary-general, has made a surprise visit to the Somali capital Mogadishu, the first by a top UN official since the start of the conflict in 1991.
He wants to put pressure on the government to step up the fight against al-Shabab, Somalia's biggest armed anti-government group.
Al Jazeera's Peter Greste reports from Mogadishu.
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