Kenya's border with Somalia set to re-open after almost 15 years

Based in Somalia, the group has masterminded a series of deadly assaults in Kenya including one on a shopping centre in the capital, Nairobi, killing 67 people in 2013 and one at a university in Garissa two years later killing 148.

In a speech, he asked all residents of Mandera, which has been targeted several times, to "join in the battle against al-Shabab. These al-Shabab are useless, I want to assure that Kenya will work together with you, just help us combat these criminals and terrorists."