Ukraine's Interior Minister Arsen Avakov posted to Facebook Sunday: "Antiterrorist operation has started in Slaviansk. It is managed by Anti-terrorist Center of the Security Service of Ukraine. All the law enforcement agencies of the country are participating. God speed!"
Ukrainian forces have launched an operation against pro-Russian activists who seized a police station on Saturday, the interior minister says.
Arsen Avakov announced on his Facebook page that "all security units" were involved in an "anti-terror operation" in the eastern city of Sloviansk.
Note: The CNN quote was timestamped at 2:28 AM. The 2:45 AM update rephrased it.