Mogadishu police official Mohamed Hussein said Tuesday that the bomb was concealed inside a Somali military pick-up truck in Mogadishu's sprawling Bakara market.
It was not immediately clear who was responsible for the attack or how the bomb was detonated, but the al-Qaida-linked rebels of al-Shabab frequently stage similar attacks in Mogadishu and elsewhere in Somalia.
The extremist al-Shabab lost control of Mogadishu in 2011 but still holds sway in large parts of rural southern Somalia.
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