Edited sentence: For some authors it was difficult to determine if this exodus was voluntarily or forced.Some authors believed that all involved parties in Bosnia were responsible for the mass exodus of Sarajevo Serbs, including the officials of Republika Srpska.Some authors explain that ethnic cleansing of Serbs from Croatia during Operation Storm (silently supported by major powers like United States and Germany) set precedent for the exodus of 150,000 terrified suburban Sarajevo Serbs who did not feel that a Muslim-led Bosnian government or the outside world will guarantee their safety