Former Ukrainian Prime Minister Yulia Tymoshenko says an explosion at her party's offices in the city of Sumy was politically motivated.
Tymoshenko, head of the Batkivshchyna (Fatherland) party, said in Kyiv that there were "political reasons" behind the "terrorist attack" early on July 4.
The explosion on the ground floor of the building did serious damage to the party's offices but did not cause any injuries.
Tymoshenko said if an impartial investigation is not carried out promptly then Batkivshchyna party members in Sumy will "publicly name those who threatened them."
She said the party officials had received telephone threats after having uncovered a "corruption agenda under the housing and utilities tariffs."