A Palestinian with his face painted in the colours of the Palestinian flag takes part in a rally marking Nakba in Gaza City May 15, 2012. Israeli security forces were on high alert for violence on Tuesday, the day when Palestinians mark "Nakba", or catastrophe, of Israel's founding in a 1948 war, when hundreds of thousands of their brethren fled or were forced to leave their homes. REUTERS/Mohammed Salem (GAZA - Tags: POLITICS CIVIL UNREST)

Members of Hamas security forces carry a large Palestinian flag during a rally marking Nakba in Gaza City May 15, 2012. Israeli security forces were on high alert for violence on Tuesday, the day when Palestinians mark "Nakba", or catastrophe, of Israel's founding in a 1948 war, when hundreds of thousands of their brethren fled or were forced to leave their homes. REUTERS/Mohammed Salem (GAZA - Tags: POLITICS CIVIL UNREST ANNIVERSARY)

Palestinians take part in a rally marking Nakba in the West Bank city of Ramallah May 15, 2012. On Tuesday, Palestinians mark "Nakba", or catastrophe, of Israel's founding in a 1948 war, when hundreds of thousands of their brethren fled or were forced to leave their homes. REUTERS/Mohamad Torokman (WEST BANK - Tags: POLITICS CIVIL UNREST ANNIVERSARY)

Palestinians gather around candles lit ahead of Nakba, in the West Bank city of Ramallah May 14, 2012. On May 15 Palestinians will mark Nakba, or catastrophe, of Israel's founding in a 1948 war, when hundreds of thousands of their brethren fled or were forced to leave their homes. REUTERS/Ammar Awad (WEST BANK - Tags: POLITICS CIVIL UNREST)

Israel braces for massive Palestinian protest

Israel is bracing for possible unrest on May 15, when Palestinians commemorate the exodus of hundreds of thousands of their kin following the foundation of the Jewish state in 1948.

Palestinian children hold candles during a rally in Khan Younis in the southern Gaza Strip, ahead of Nakba May 14, 2012. On May 15 Palestinians will mark Nakba, or catastrophe, of Israel's founding in a 1948 war, when hundreds of thousands of their brethren fled or were forced to leave their homes. REUTERS/Ibraheem Abu Mustafa (GAZA - Tags: POLITICS CIVIL UNREST)

In this Sunday, May 6, 2012 photo, Palestinian Prime Minister Salam Fayyad leaves a tent set up in solidarity with Palestinian prisoners on hunger strike in Israeli jails, in the West Bank town of Nablus. According to Israel's Prison Service at least one-third of the 4,600 Palestinian prisoners in Israel began a collective hunger strike in mid-April 2012. (AP Photo/Nasser Ishtayeh)

A girl holds a portrait of a Palestinian held in an Israeli jail during celebrations after a deal to end a prisoners hunger strike was agreed, in the West Bank city of Ramallah May 14, 2012. Palestinian prisoners on hunger strike agreed a deal with Israel on May 14 to end their fast in return for an easing of their conditions, officials on both sides said. Most of the 1,550 prisoners had stopped eating for up to four weeks to demand better conditions.

Palestinian scouts hold a flag signed with their names at a protest organized by the Palestinian Institute for Human Rights "Shahed", to mark the 64th anniversary of Nakba, and to condemn the international silence towards the rights of Palestinian people to return to their homeland, in front of the U.N. headquarters offices in Beirut May 15, 2012. Nakba, or catastrophe, marks Israel's founding in 1948 war, when hundreds of thousands of Palestinians fled or were forced to leave their homes. REUTERS/Sharif Karim (LEBANON - Tags: POLITICS CIVIL UNREST ANNIVERSARY)