Students who witnessed the incident told school principal Dragomir Zugic that Petkovic, turning to leave, raised the gun to his head and shot himself.
Učenici koji su bili očevici incidenta rekli su direktoru škole Dragomiru Zugiću da je Petković, okrenuvsi se da napusti učionicu, podigao pištolj i pucao sebi u glavu.