Thousands of people will attend a ceremony later to mark the 20th anniversary of the worst massacre in Europe since World War II.
More than 8-thousand Muslim men and boys were killed in Srebrenica after Bosnian-Serb troops overran the town in the former Yugoslavia.
Some Serbian nationalists still refuse to accept it was a genocide.
Steve Crawshaw from Amnesty International says around a thousand bodies still haven't been found:
