Relatives of Salafist prisoners being held by Hamas hold an Al-Qaeda-affiliated flag during a demonstration calling for their release in Rafah in the southern Gaza Strip on April 6, 2013. The Islamist movement Hamas, which has ruled the Gaza Strip since 2007, has regularly cracked down on hardline Salafists in the territory, notably in 2009.Photo by Abed Rahim Khatib / Flash90

Relatives of Salafist prisoners being held by Hamas hold an Al-Qaeda-affiliated flag during a demonstration calling for their release in Rafah in the southern Gaza Strip on April 6, 2013. The Islamist movement Hamas, which has ruled the Gaza Strip since 2007, has regularly cracked down on hardline Salafists in the territory, notably in 2009.Photo by Abed Rahim Khatib / Flash90

Arab children seen drawing colofrdul pictures of the Dome of the Rock, as they attend the Aqsa children's festival at the Muslim Shrine AL Aqsa, in Jerusalem's Old CIty. April 06, 2013. Photo by Sliman Khader/FLASH90

A Hamas flag seen at the Aqsa children's festival at the Muslim Shrine AL Aqsa, in Jerusalem's Old CIty. April 06, 2013. Photo by Sliman Khader/FLASH90

A young Palestinian boy seen at the Aqsa children's festival at the Muslim Shrine AL Aqsa, in Jerusalem's Old CIty. April 06, 2013. Photo by Sliman Khader/FLASH90

Palestinian woman walks in front of the UN headquarters building in Gaza City on April 6, 2013. Gaza's Hamas rulers urged the United Nations to reconsider its suspension of food aid for Palestinian refugees, imposed after protesters stormed a UN depot. Photo by Wissam Nassar/FLASH90

A Palestinian man waits outside of the UN headquarters building in Gaza City on April 6, 2013. Gaza's Hamas rulers urged the United Nations to reconsider its suspension of food aid for Palestinian refugees, imposed after protesters stormed a UN depot. Photo by Wissam Nassar/FLASH90

A Palestinian Security man stands inside the UN headquarters building in Gaza City on April 6, 2013. Gaza's Hamas rulers urged the United Nations to reconsider its suspension of food aid for Palestinian refugees, imposed after protesters stormed a UN depot. Photo by Wissam Nassar/FLASH90

Palestinian students walk past a UN distribution center in the Jabalia refugee camp in the northern Gaza Strip on April 6, 2013. Gaza's Hamas rulers urged the United Nations to reconsider its suspension of food aid for Palestinian refugees, imposed after protesters stormed a UN depot. Photo by Wissam Nassar/FLASH90

A Palestinian man waits outside of the UN headquarters building in Gaza City on April 6, 2013. Gaza's Hamas rulers urged the United Nations to reconsider its suspension of food aid for Palestinian refugees, imposed after protesters stormed a UN depot. Photo by Wissam Nassar/FLASH90

Palestinian students walk past a UN distribution center in the Jabalia refugee camp in the northern Gaza Strip on April 6, 2013. Gaza's Hamas rulers urged the United Nations to reconsider its suspension of food aid for Palestinian refugees, imposed after protesters stormed a UN depot. Photo by Wissam Nassar/FLASH90

Palestinian women walk past a UN distribution center in the Jabalia refugee camp in the northern Gaza Strip on April 6, 2013. Gaza's Hamas rulers urged the United Nations to reconsider its suspension of food aid for Palestinian refugees, imposed after protesters stormed a UN depot. Photo by Wissam Nassar/FLASH90

The closed gate of a UN distribution center is pictured on April 6, 2013 in the Jabalia refugee camp in the northern Gaza Strip. Gaza's Hamas rulers urged the United Nations to reconsider its suspension of food aid for Palestinian refugees, imposed after protesters stormed a UN depot. Photo by Wissam Nassar/FLASH90

A Palestinian boy transports sacks of donated food past the United Nations Relief and Works Agency (UNRWA) headquarter in Gaza Strip, 06 April 2013. The UN aid agency said on 04 April that it has suspended operations in the Gaza Strip after angry Palestinians stormed one its compounds in the impoverished enclave to protest cuts. The UNRWA said in a statement it had to reduce cash payments to the poorest refugee families in the Gaza Strip as a result of budget shortfalls. 'The situation could very easily have resulted in serious injuries to UNRWA staff and to the demonstrators', Robert Turner, UNRWA head in Gaza, said after the incident on 04 April. 'This escalation, apparently pre-planned, was unwarranted and unprecedented'. Photo by Wissam Nassar/FLASH90

Palestinian children play under depicting of Palestinians killed in the Al-Sheikh Radwan area in Gaza City, 06 April 2013. Photo by Wissam Nassar/Flash90

A Palestinian man looks up to a mural depicting former Palestinian leader Yasser Arafat as he sits in a chair on the street for a cigarette break in the Al-Sheikh Radwan area in Gaza City, 06 April 2013. The UN aid agency on Friday, 05 April 2013, had suspended its cash distribution programme in the Gaza Strip after angry Palestinians stormed its compound in the impoverished enclave to protest cuts. The United Nations Relief and Works Agency (UNRWA) said in a statement it had to reduce cash payments to the poorest refugee families in the Gaza Strip as a result of budget shortfalls. Photo by Wissam Nassar/Flash90

A Palestinian baby sits in a box attached to the carrier of a motorcycle in front of her father's shop in the Al-Sheikh Radwan area in Gaza City, 06 April 2013. The UN aid agency on Friday, 05 April 2013, had suspended its cash distribution programme in the Gaza Strip after angry Palestinians stormed its compound in the impoverished enclave to protest cuts. The United Nations Relief and Works Agency (UNRWA) said in a statement it had to reduce cash payments to the poorest refugee families in the Gaza Strip as a result of budget shortfalls. Photo by Wissam Nassar/Flash90

Palestinian children sit under depicting of Palestinians killed in the Al-Sheikh Radwan area in Gaza City, 06 April 2013. Photo by Wissam Nassar/Flash90