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.
Media regulations across the region have been tightened under states of emergency and journalists have been arrested on accusations of spreading misinformation concerning the response of authorities to the spread of the novel coronavirus.
Some countries have sought to centralise the dissemination of official information and banned certain media from regular briefings.
The Defence Ministry reacted angrily on Wednesday evening after the Council of Europe's commissioner for human rights, Dunja Mijatovic, criticised it for hosting a promotional event in Belgrade for a book that denies court findings that Bosnian Serb forces were responsible for the May 1995 massacre in Tuzla.
After the UN's country team in Bosnia expressed strong concern over the forcible transfer of migrants and asylum-seekers to the Vucjak camp on the western border with Croatia - noting serious security and health risks - the Council of Europe's Commissioner for Human Rights has condemned Bosnia's handling of the situation.
Council of Europe Commissioner for Human Rights Dunja Mijatovic posted this on Facebok on Monday, adding:
"We all, state authorities, international organizations, civil society, academia and the media must do our utmost to counter this trend and recommit to the values and principles born after the tragedy of the Holocaust."