The Serbian government has banned events in Belgrade commemorating the 20th anniversary of the Srebrenica massacre, after threats were made by right-wing extremists.
An official memorial will take place in Srebrenica however activists intended to hold a gathering outside the Serbian parliament in the capital.
Serbia's Interior Minister Nebojsa Stefanovic said he had taken the decision to guarantee "peace and security in the whole of Serbia", but organiser Dusan Masic, said it was "scandalous", and showed "where Serbia is in 2015".
On Wednesday, a United Nations Security Council resolution proposed by the UK, describing the Srebrenica massacre as "genocide", was vetoed by Russia.
Over 8,000 Bosniak men and boys were killed by Bosnian Serb forces in the village which was supposed to be a UN refuge.
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