Men carried Bosnian state flags during a march to Srebrenica, Bosnia. On Friday, hundreds of Bosnians began a four-day march along the route survivors used 13 years ago to escape the Bosnian Serb killings in Srebrenica, where the worst massacre in Europe since World War II occurred. A mass burial for more than 300 identified persons exhumed from mass graves from the Srebrenica massacre is expected to be held Wednesday.