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KIEV, June 18 (Reuters) - At explosion at a pipeline in Ukraine's Poltava region on Tuesday was caused by a bomb, Interior Minister Arsen Avakov said on Wednesday.
"We assume that the explosive device was placed under a concrete block supporting the pipeline and that there were two explosions," Avakov said in a report to a government meeting.
"We are studying the circumstances ... external interference is the main cause we are focusing on," he said.
Ukraine said on Tuesday it believed that the attack on a pipeline carrying Russian gas to the rest of Europe had been intended to discredit Ukraine as a reliable supplier. (reporting by Pavel Polityuk; Writing By Richard Balmforth; Editing by Andrew Heavens)