This was announced by SBU press officer Olena Hitlianska on her Facebook page, Censor.NET reports.
She noted she could not yest disclose all the details for legal reasons.
"Procedural activities are underway. Some of the detainees have been served suspicion notes; productions regarding selection of restraint measures for them have been sent to court. The investigation continues to check the version that this sabotage group had been controlled by Russian special forces and conducted tasks on preparation of terrorist acts in Ukraine and its capital," Hitlianska stressed.
SBU speaker also specified that the killed group leader was 50-year-old Oleh Muzhchyl.
"The facts of his multiple travels abroad with fake passports are being confirmed. It has been established that the last trip of the group's leader to Russia occurred in September-October this year," Hitlianska added.