The northeastern Ukrainian city of Sumy witnessed an explosion in the local office of the right-wing Svoboda party in the early hours of Tuesday, causing extensive damage but leaving no one injured.
The police have launched an investigation into the incident and are not excluding the possibility that it was a terrorist act, according to the local Web site 0542.ua, Ukraine Today reports.
Ukraine's State Security Service has earlier reported that Russia-trained subversive groups had been involved in a series of recent attacks in Odesa and Kharkiv.
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