A Palestinians walks near a UN truck collecting rubbish in Rafah refugee camp in southern Gaza Strip on May 12, 2013. To mark the 65th anniversary of the "Nakba" (catastrophe). Nakba means "catastrophe" in reference to the birth of the state of Israel 65 years ago in British-mandate Palestine, which led to the displacement of hundreds of thousands of Palestinians who either fled or were driven out of their homes during the 1948 war over Israel's creation. Photo by Abed Rahim Khatib/Flash 90

A Palestinian man carries his son while standing in front of their house in the Rafah refugee camp in southern Gaza Strip on May 12, 2013. To mark the 65th anniversary of the "Nakba" (catastrophe). Nakba means "catastrophe" in reference to the birth of the state of Israel 65 years ago in British-mandate Palestine, which led to the displacement of hundreds of thousands of Palestinians who either fled or were driven out of their homes during the 1948 war over Israel's creation. Photo by Abed Rahim Khatib/Flash 90

Palestinian girl stands at the window of their house in the Rafah refugee camp in southern Gaza Strip on May 12, 2013. To mark the 65th anniversary of the "Nakba" (catastrophe). Nakba means "catastrophe" in reference to the birth of the state of Israel 65 years ago in British-mandate Palestine, which led to the displacement of hundreds of thousands of Palestinians who either fled or were driven out of their homes during the 1948 war over Israel's creation.Photo by Abed Rahim Khatib/Flash 90

A Palestinian refugee, Saleh Saleh Abu Ross, 79 years old, from the Rafah refugee camp, holds up a key allegedly from his house in Beersheba, located in southern Israel, during a rally, in Rafah, southern Gaza Strip on May 12, 2013. To mark the 65th anniversary of the "Nakba" (catastrophe). Nakba means "catastrophe" in reference to the birth of the state of Israel 65 years ago in British-mandate Palestine, which led to the displacement of hundreds of thousands of Palestinians who either fled or were driven out of their homes during the 1948 war over Israel's creation. Photo by Abed Rahim Khatib/Flash 90

Palestinian boy walks front of graffiti that reads "Returning" as palestinians attend "camp of return" to mark refugees' ties to lands lost, in Rafah, southern Gaza Strip on May 12, 2013. To mark the 65th anniversary of the "Nakba" (catastrophe). Nakba means "catastrophe" in reference to the birth of the state of Israel 65 years ago in British-mandate Palestine, which led to the displacement of hundreds of thousands of Palestinians who either fled or were driven out of their homes during the 1948 war over Israel's creation. Photo by Abed Rahim Khatib/Flash 90