No one has been charged in the attack. Assailants fled the scene in a car after shooting Ivanovic six times in the back. Wednesday's march was organized by the same groups behind weeks of protests against Serbia's populist President Aleksandar Vucic. They say finding Ivanovic's killers is crucial for the rule of law and justice.
Vucic attended a separate commemoration ceremony for Ivanovic earlier Wednesday. Serbia has refused to recognize Kosovo's 2008 declaration of independence.