In order to increase the toll, the organizers sent forged invitations on behalf of the Association of Reserve Officers. At 07:00 on the 16th, Zadgorski led Nikola Petrov to the roof, where Petrov would detonate the bomb on Zadgorski's signal.
To increase the toll, organizers created fake invitations in the name of the Association of Reserve Officers. At 7:00 AM on the 16th, Zadgorski led Nikola Petrov to the roof where Petrov was instructed to detonate the bomb upon Zadgorski's signal.