At least 10,000 were killed by sniping and shelling from Serbs in the surrounding mountains.
Thousands of people were held in camps on all three sides, where many were tortured, starved or executed. It is estimated that more than 20,000 women, mostly Muslims, were systematically raped.
The worst atrocity occurred in July 1995 when Bosnian Serb forces overran the eastern town of Srebrenica, slaughtering almost 8,000 Muslim men and boys in a massacre described by two international courts as genocide.
The conflicts in Croatia and Bosnia claimed more than 120,000 lives. In Bosnia alone more than half of those in the pre-war population were forced out of their homes, either in campaigns of ethnic cleansing or bids to find safety.
Slobodan Milosevic was a politician best known as the Serbian and Yugoslavian president in the late 1980s through the '90s. After losing power in 2000, he was charged for crimes against humanity.
The breakup of Yugoslavia occurred as a result of a series of political upheavals and conflicts during the early 1990s. After a period of political crisis in the 1980s, constituent republics of the Socialist Federal Republic of Yugoslavia split apart, but the unsolved issues caused bitter inter-ethnic Yugoslav war
Ethic conflict and political conflict are two reason the war broke out.