On October 3 , 1999 , a vehicle column of Serbian Renewal Movement ( SPO ) , one of Serbia 's largest opposition parties at the time , was attacked while moving down Ibar Highway . A tipper truck rammed into the moving vehicles . SPO officials Veselin Bošković , Zvonko Osmajlić , Vučko Rakočević , and Dragan Vušurović were killed in the staged accident and SPO president Drašković was injured . In a ruling by the Belgrade District Court on February 16 , 2007 , former State Security officer and unit 's commander Milorad Ulemek , was sentenced to 15 years in prison and former State Security chief Radomir Marković received eight years . Members of the Special Operations Unit , JSO , Duško Maričić , Branko Berček , Nenad Bujošević , and Leonid Milivojević were sentenced to 14 years in prison
attacked while moving down Ibar Highway
Ibar Highway assassination attempt
Special Operations Unit (Serbia)