In 60 seconds: Who are al-Shabab?
18 June 2014 Last updated at 11:13 BST
Al-Shabab Islamist militants are battling the UN-backed government in Somalia, and are suspected of links to a string of attacks in neighbouring Kenya.
The group, which is allied to al-Qaeda, has been pushed out of most of the main towns it once controlled, but it remains a potent threat.
Here's all you need to know about al-Shabab - in 60 seconds.
Video produced by Michael Hirst.