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A policeman stands guard in Kiev on April 27, 2012 during an anti-terrorist drill of the Ukrainian secret services. Twenty-seven people were injured today in the eastern Ukrainian city of Dnipropetrovsk in four back-to-back blasts that the country’s leader called a challenge to the nation. „There is a total of 27” injured in three blasts, an emergencies ministry official said. „We understand that this is yet another challenge for us, for the whole entire nation,” Ukrainian President Viktor Yanukovych said, cited by the Interfax news agency. AFP PHOTO/ SERGEI SUPINSKY