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People walk in front of the entrance of the Donka Hospital, where victims of the ebola disease are being treated, in Conakry March 28, 2014. Authorities in Guinea scrambled on Friday to halt the spread of Ebola in the capital as the Health Ministry identified another four suspected cases of a deadly virus outbreak that is estimated to have already killed 70. Picture taken March 28, 2014. REUTERS/Saliou Samb (GUINEA- Tags: HEALTH SOCIETY)