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Somalia's president is claiming victory after al-Shabab fighters began pulling out of the capital Mogadishu.

Officials say it is the most significant gain for the UN-backed transitional government in years.

Al-Shabab say it is a change in military tactics rather than a retreat.

Al Jazeera's Peter Greste visited the Islamist group's former headquarters in Mogadishu.

Source: Al Jazeera