A Palestinian throws back tear gas canister shot by Israeli soldiers near a check point in the West Bank city of Ramallah, May 13, 2011. Clashes were seen in several areas of the West Bank and East Jerusalem, on the occasion of the 63rd anniversary of the Nakba or "catastrophe day" in Arabic that is an annual event of commemoration for the Palestinian people of the displacement that followed the 1948 Palestine War, during which about 700,000 Palestinians were expelled or fled. [Xinhua/Chen Xu]