- Al-Shabaab is an al-Qaeda-linked militant group based in Somalia
- It was once allied with Sharia courts, which tried to impose order on the lawless country
- The U.S. government designated Al-Shabaab as a foreign terrorist group in 2008
- Al-Shabaab claimed responsibility for the deadly attack at a Kenyan mall in September 2013
(CNN)The attack is harrowing: Al-Shabaab militants raid a quarry in Kenya, separating non-Muslim workers from their Muslim counterparts and executing them.