Gunmen seize police station in Ukraine

Caption:Pro-Russia protesters guard a barricade outside a regional police building seized by armed separatists in Slavyansk on April 13, 2014. Ukraine on Sunday launched an 'anti-terrorist operation' in the eastern town of Slavyansk, where pro-Russian gunmen have seized police and security services buildings, Interior Minister Arsen Avakov said. AFP PHOTO / GENYA SAVILOV (Photo credit should read GENYA SAVILOV/AFP/Getty Images)

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    Gunmen seize police station in Ukraine

CNN's Nick Paton Walsh reports on Ukraine's announcement that they are launching an anti-terrorism operation.