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At least 15 people have been killed in a suicide attack in the northern city of Kano where a local college was targeted. According to police, two attackers are among the dead. Officials blame terrorist group Boko Haram, who have been known to target students. President Goodluck Jonathan has called the attack ‘dastardly’. CCTV’s Deji Badmus reports. Viewers may find some of the following images disturbing