Who are the Kenya mall attackers?

Kenya security forces crouch behind a wall outside the Westgate Mall in Nairobi, Kenya, on Monday, September 23.
Kenya security forces crouch behind a wall outside the Westgate Mall in Nairobi, Kenya, on Monday, September 23.

    JUST WATCHED

    Who are the Kenya mall attackers?

MUST WATCH

Here's a closer look at the Al-Shabaab militant group who've taken responsibility for an attack at a Nairobi mall.