In 60 seconds: Who are al-Shabab?

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.