Brother and sister, Nikola (17) and Marija (15) Petrovic from Gracanica died along with their grandmother on May 1, two decades ago, when NATO bombed Nis-Express bus on the Pristina-Nis highway in Luzane, Serbian media in Kosovo report. The two teens and their grandmother were on their way back from Prokuplje to Gracanica. No one was hold responsible for this crime. 60 people, including 15 children died in the attack on Nis-Express bus, destroyed by NATO bombs while crossing the bridge in Luzane, 18 kilometres north of Pristina. The bridge was not damaged, and the attack was carried out around midday with clear weather conditions, Serbian media recall. About an hour later an ambulance was also targeted leaving one doctor severely injured. The two streets were named after Nikola and Marija Petrovic in Gracanica where their parents still live.