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Kenya's police chief has said 21 people are now known to have died in Tuesday's attack at the hotel and office complex in Nairobi. Nigerian presidential candidate, Atiku Abubakar, has told the Â鶹Éç that he has doubts about the credibility of next month's election. Researchers behind a new study say the world needs to drastically change what it eats and how food is grown to feed 10 billion people by 2050.