The accused made and tested their bombs in the three cities in
2010-2012, Ivan Derevyanko, the Security Service’s chief investigator,
told a news conference in Kyiv.
After their final attack in Dnipropetrovsk, the bombers sent letters
to government agencies and media outlets demanding $4.5 million and were
arrested in a sting operation in which the SBU transferred a sum of
money to bank accounts indicated by them, Derevyanko said.
Evidence collected by the SBU included a video tape showing the
accused planting a bomb and expert assessments that they had used some
of the items seized from them in making their bombs.