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Somalia's militant Islamist group al-Shabab says it has shot dead a prominent MP in the capital, Mogadishu.

Ahmed Mohamud Hayd was killed in a drive-by shooting after he left his hotel in a heavily policed area, witnesses said.

His bodyguard was also killed and a parliamentary secretary wounded in the shooting, witnesses added.

Al-Shabab, which is linked to al-Qaeda, has vowed to step up attacks during the Islamic holy month of Ramadan.

It lost control of Mogadishu to a 22,000-strong African Union (AU) force in 2011, but has continued to carry out bombings and assassinations in the city.

The killing of Mr Hayd - a former army commander and government minister - has shocked many people, the BBC's Moalimu Mohammed reports from Mogadishu.

The shooting was brazen, with gunmen following Mr Hayd and then opening fire on his vehicle.

Al-Shabab spokesman Abdulaziz Abu Musab said the group had carried out the "targeted assassination".

"We will continue to hunt other MPs if they do not leave the apostate organisation [parliament]," he told AFP news agency.

The al-Qaeda-linked group wants to establish an Islamic state in Somalia.