article_snippet.sent: The Al-Shabaab militant group claimed responsibility.
article_snippet.sent: Kenya launched airstrikes Monday targeting Al-Shabaab's training camps in Somalia, according to a military source, adding that the strikes were not retribution for last week's massacre at the university.
article_snippet.sent: The  senior Al-Shabaab leader is also known by the aliases Dulyadin and Gamadhere, Kenya's Interior Ministry said.
article_snippet.sent: Kenya's Interior Ministry offered  a reward of 20 million Kenyan shillings, or about $215,000, for information on The  senior Al-Shabaab leader whereabouts.
article_snippet.sent: The  senior Al-Shabaab leader is in charge of external operations against Kenya, according to a government document, and commands the militia along the border.
article_snippet.sent: Another terrorist involved in the attacks is Abdirahim Abdullahi, a Kenyan-Somali  and the son of a  government chief in Mandera, authorities said.
article_snippet.sent: Al-Shabaab is based in Somalia, and Al-Shabaab violence has spread to Kenya before.  
article_snippet.sent: Al-Shabaab has intensified attacks in Kenya since Kenya sent troops to Somalia four years ago to help battle militants.