The commemoration was a scaled-down version of the annual White Armband Day event in Prijedor, where large-scale crimes were committed during the war including killings, expulsions and the unlawful detentions of civilians in prison camps.
A total of 3,176 people were killed in the area, among them 256 women and 102 children - the majority of them Bosniaks.
The Serb-led entity in Bosnia, Republika Srpska, has halted all projects being implemented with Chinese companies owing to concerns about the possible spread of the coronavirus.
Milorad Dodik, Serbian member of the Bosnian Presidency, announced the move on Sunday to Serbian television Pink, noting the potential economic consequences of the continued spread of the virus.
Cities around Bosnia are commemorating the horrendous crimes committed against the non-Serb population of the northeastern town of Prijedor 25 years ago by putting up white ribbons.