Kanavalau planned the blast right after the army?
Uladzislau Kavalyou claimed this during the preliminary investigation. The public prosecutor read out the protocol of that interrogation at the trial.
According to BELTA, Kavalyou confessed at the interrogation that he knew about Dzmitry Kanavalau's plans with regard to the metro blast before April 2011. Allegedly, Kanavalau intended to make a blast in the carriage first, not at the station. He even stole certain objects in the military unit where he served. According to Kavalyou, Kanavalau probably failed to use those objects.
New details of the explosive device used in the metro were revealed at the interrogation. Kavalyou claimed there was a "black alarm" in the bomb. Alongside with that, the explosive device differed from Kanavalau's previous devices. Another substance was used in it, Kavalyou claimed at the interrogation.
