In Somalia, Prime Minister, Omar Abdirashid Ali Sharmarke has resigned amid a power struggle with the country's president. President Sheikh Sharif Ahmed's UN-backed government is battling Islamist group al-Shabab for control of the capital, Mogadishu. Correspondents say his squabbling with the prime minister has hampered the fight against the insurgents. Sharmarke has been under intense pressure to resign for some months.