The Batkivshchyna party's office located on the ground floor of an apartment building in Sumy was blown up in the early hours of Saturday.
The Sumy regional police department reported on Saturday that an anonymous telephone caller had informed the city police department at 2:55 a.m. that the Batkivshchyna office had been blown up.
"The policemen who arrived at the scene determined that there were no human casualties, and a shock wave destroyed dividing walls, windows, and doors inside the office, and knocked some windows out of the house," it said.
Security Service, Interior Ministry, and prosecution officials are working at the scene.
The Security Service has yet to decide whether to open a criminal investigation under Ukrainian Criminal Code Article 258, Part 1 (terrorist attack).
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