Islamist militants in Somalia have executed two people they accused of spying for foreign organisations. Hundreds of people watched as a firing squad arranged by the al-Shabab group shot the pair in the capital, Mogadishu. Al-Shabab officials said the men had been found guilty of working for the US CIA and African Union peacekeepers. The US regards al-Shabab as a proxy for al-Qaeda in Somalia, and says the group threatens to destabilise the region.