Find out more about Al-Shabaab, the al Qaeda-linked militant group behind the deadly Kenya mall siege.
Al-Shabaab became affiliated with al Qaeda in 2012, and has been carrying out guerrilla-style hit-and-run attacks against troops with the African Union Mission in Somalia. At least 3,000 AMISOM peacekeepers have been killed in Somalia since 2007, according to the UN.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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