In the evening on Monday, June 13, there was a severe thunderstorm in Belgrade. According to the testimonies of the citizens of Lisicji potok and Miljakovac, the area of the military depot was stuck by thunder at 11.30 p.m. The blast was so strong that all car-alarms in the area were set off. The soldier who was on sentry duty said later that he had thrown himself on the ground, seeing the first flames and hearing the first explosion within seconds. Accompanied by another sentry, he dashed to wake up the officer on duty, who ordered that the object be immediately evacuated.