The school 's back yard was hit by an Orkan rocket on 2 May 1995 during the rocket attack on Zagreb in the Croatian War of Independence . The attack was noted in the trial judgement in the Martic case at the ICTY . The attack occurred during class-time which prevented many casualties which would have occurred had it been break-time , during which students roam the back yard on warm May days . The damage was soon repaired
rocket attack on Zagreb
Zagreb rocket attacks
Classical Gymnasium in Zagreb