Palestinians burn pictures of US President Barack Obama during a protest against his visit to the West Bank, in the southern Gaza Strip town of Rafah on March 21, 2013. Obama arrived in the West Bank to a more prickly welcome from Palestinian leaders than the warm embrace he won in Israel the day before. Photo by Abed Rahim Khatib / Flash90

Palestinians burn pictures of US President Barack Obama during a protest against his visit to the West Bank, in the southern Gaza Strip town of Rafah on March 21, 2013. Obama arrived in the West Bank to a more prickly welcome from Palestinian leaders than the warm embrace he won in Israel the day before. Photo by Abed Rahim Khatib / Flash90

Palestinians set fire to an effigy of US President Barack Obama during a protest against Obama's visit to the West Bank, in the southern Gaza Strip town of Rafah on March 21, 2013. Obama arrived in the West Bank to a more prickly welcome from Palestinian leaders than the warm embrace he won in Israel the day before. Photo by Abed Rahim Khatib / Flash90

Palestinians prepare to set fire to an effigy of US President Barack Obama during a protest against Obama's visit to the West Bank, in the southern Gaza Strip town of Rafah on March 21, 2013. Obama arrived in the West Bank to a more prickly welcome from Palestinian leaders than the warm embrace he won in Israel the day before. Photo by Abed Rahim Khatib / Flash90

Palestinians burn pictures of US President Barack Obama during a protest against his visit to the West Bank, in the southern Gaza Strip town of Rafah on March 21, 2013. Obama arrived in the West Bank to a more prickly welcome from Palestinian leaders than the warm embrace he won in Israel the day before. Photo by Abed Rahim Khatib / Flash90

Palestinians burn pictures of US President Barack Obama during a protest against his visit to the West Bank, in the southern Gaza Strip town of Rafah on March 21, 2013. Obama arrived in the West Bank to a more prickly welcome from Palestinian leaders than the warm embrace he won in Israel the day before. Photo by Abed Rahim Khatib / Flash90

Palestinians walk past murals depicting slogans for Hamas in the Rafah refugee camp in the southern Gaza Strip on March 21, 2013. Two rockets launched from the Gaza Strip which hit the southern city of Sderot, rockets fired by militants in the Hamas-run Gaza Strip hit southern Israel as US President Barack Obama was visiting the Jewish state, police said. Photo by Abed Rahim Khatib / Flash90

Equipment and heavy machinery arrive to Gaza for the first time through the Rafah border crossing with Egypt dedicated to the Qatari project for the reconstruction of the Gaza Strip, on March 21, 2013. Indirect talks between Israel and Gaza-rulers Hamas, held earlier this year, included opening the Rafah crossing on Gaza's border with Egypt to enable the transfer of construction materials from Qatar, as well as enabling agricultural produce from Gaza to enter Israel. Photo by Abed Rahim Khatib/Flash90

Equipment and heavy machinery arrive to Gaza for the first time through the Rafah border crossing with Egypt dedicated to the Qatari project for the reconstruction of the Gaza Strip, on March 21, 2013. Indirect talks between Israel and Gaza-rulers Hamas, held earlier this year, included opening the Rafah crossing on Gaza's border with Egypt to enable the transfer of construction materials from Qatar, as well as enabling agricultural produce from Gaza to enter Israel. Photo by Abed Rahim Khatib/Flash90

Equipment and heavy machinery arrive to Gaza for the first time through the Rafah border crossing with Egypt dedicated to the Qatari project for the reconstruction of the Gaza Strip, on March 21, 2013. Indirect talks between Israel and Gaza-rulers Hamas, held earlier this year, included opening the Rafah crossing on Gaza's border with Egypt to enable the transfer of construction materials from Qatar, as well as enabling agricultural produce from Gaza to enter Israel. Photo by Abed Rahim Khatib/Flash90