Palestinians in exile and in Palestine, observed Saturday a two-minute silence and organized rallies in commemoration of the 56th anniversary of the Nakba (establishment of Israel). Hundreds of mass rallies were organized in all Palestinian cities and refugee camps of the West Bank and the Gaza Strip. During the rallies, Palestinians raised the names of more than 500 villages wiped off the map by Israeli gangs in 1948 and replaced by Israeli names and cities. On his part, Palestinian president, Yasser Arafat said Saturday that no power in the entire world has the right to make concessions on the right to return of the Palestinian Refugees. On the 56th anniversary of "Nakba", Arafat said in his speech that the Israeli government could not exonerate itself from its moral, political and international responsibility concerning the Palestinian catastrophe. "The Right of the Palestinian refugees to return to their homes is a sacred and inalienable right that is internationally protected and endorsed," he said, adding that "this right is heroically defended by the Palestinian people in the face of the Israeli occupation, colonization and against the Apartheid Wall of Annexation and expansion and in defense of our Christian and Islamic sanctuaries." Arafat concluded that the Israeli occupation of the Palestinian land is doomed to failure. **PHOTO CAPTION*** Palestinian children hold signs bearing the names of villages Palestinians say were demolished by Israel in the 1948 war, during a demonstration marking Al Naqba, meaning the 'the catastrophe' in the West Bank town of Ramallah, Saturday May 15, 2004. (AP)