In Mogadishu, the move caused some opposition leaders to retreat into their clan strongholds.

Among those embroiled in the fighting on Sunday was Sadek John, a former police chief of Mogadishu who was dismissed in mid-April after he opposed Mr. Mohamed, according to a Somali police official who spoke on the condition of anonymity because he was not authorized to talk to the press.

Declan Walsh reported from Nairobi, Kenya and Hussein Mohamed from Mogadishu, Somalia.

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