Kenya sent its security forces to find and kill those who did it. The group that claimed responsibility was al-Shabaab, which is near the border in Somalia. It is affiliated with al Qaeda.
When Kenya's security forces came to the Somalian camp, they destroyed it, killing about 100 militants. The Kenyan Deputy President William Ruto afterwards said they launched two successful operations, and that the camp where the attack was planned was destroyed.
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Source: http://www.cnn.com/2014/11/23/world/africa/kenya-bus-attack-retaliation/index.html
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Graphics: Mine
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Keywords: Kenya, security forces, kill, terrorists, al Shabaab, bus attack