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A survivor of an attack by islamist gunmen claimed by al-Shabab on a university campus in Garissa, northern Kenya is comforted by a colleague after arriving in Nairobi on April 4, 2015. Kenya’s President, Uhuru Kenyatta vowed Saturday, to retaliate in the severest way against Somalia’s al-Shabab islamists after they massacred nearly 150 people at a university. AFP PHOTO/Tony KARUMBA