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The battle to secure Somalia

23 September 2013 Last updated at 17:17 BST

The Somali Islamist al-Shabab movement has said it carried out an attack on a shopping centre in Nairobi in retaliation for Kenyan military operations in Somalia.

African Union forces have been trying to stop fighting between different factions within Somalia, but the situation in the country remains highly volatile, as the BBC's Mark Doyle reports.