A survivor (center) is reunited with relatives in Nairobi on April 4, 2015, after an attack by islamist gunmen claimed by al-Shabab on a university campus in Garissa, northern Kenya. 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. Tony Karumba/AFP Getty Images
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