Palestinians burn the Israeli flag during a rally marking the "Nakba" (Catastrophe) in the West Bank city of Nablus on May 15, 2008. Palestinians protested across the occupied territories on the 60th anniversary of the "catastrophe" of the birth of Israel today as the Jewish state's army went on high alert. The commemoration of the Naqba, or "catastrophe" -- the defeat of five invading Arab armies and the expulsion or flight of about 760,000 people -- comes as US President George W. Bush addresses Israel's parliament.