Srebrenica massacre – 20th anniversary 1992: Bosnia-Herzegovina declares independence from Yugoslavia. War erupts between Serb, Croat and Muslim factions. Bosnian Serbs, under Radovan Karadzic, lay siege to Sarajevo 1993: Amid reports of ethnic cleansing, UN declares safe havens for Bosnian Muslim civilians 1994: Battalion of 570 Dutch troops assumes UN peacekeeping duties in Srebrenica enclave Jul 6-10, 1995: Bosnian Serb forces attack Srebrenica. Around 30 Dutch troops taken hostage Jul 11: Over 20,000 refugees flee to main Dutch base at Potocari. UN airstrikes on Bosnian Serb positions suspended after Serbs threaten to kill Dutch hostages. Bosnian Serb troops under General Ratko Mladic enter Srebrenica Jul 12: Bosnian Serb forces begin deporting women and children and separating out all males aged 12 to 77 for “interrogation” Jul 13: Dutch troops hand over 5,000 civilians sheltering at Potocari to Bosnian Serb army in exchange for release of 14 Dutch peacekeepers Jul 16: Reports of massacres start to emerge. Around 8,000 Bosnian Muslim men and boys killed in Srebrenica in just three days – worst atrocity on European soil since Holocaust Jul 1995 UN safe haven Bosnian Serb control Bosnian / Croat control CROATIA BOSNIA SERBIA 50km 30 miles Zepa Sarajevo Srebrenica Tuzla Potocari Bihac Gorazde Serb control Picture: Getty Images