The signing ceremony launching the Palestinian unity deal between Hamas and Fatah factions took place at noon Wednesday at Egypt's intelligence headquarters.
Head of Hamas's political bureau Khaled Mashaal and the Palestinian president Mahmoud Abbas in addition to top officials from Arab, Islamic and European countries, including secretary-general of Ahmet Davutoglu, the European union's high representative for foreign affairs Catherine Ashton, prince of Qatar Sheikh Hamad Bin-Khalifa, have attended the ceremony.
Ambassadors of Arab, Islamic and European countries were also invited to the ceremony.
Palestinian factions signed the reconciliation deal on Tuesday uniting the West Bank and Gaza under one government that will shortly be formed.
Meanwhile, Saudi Arabia has called on the powerful Quartet to encourage and support the signed Hamas-Fatah unity deal, and not only to recognize it.
Saudi Arabian Prince Talal bin Badr Al Saud advocated that Palestinian unity is in the interest of democracy, stability, and peace in the region.
He declared the abrupt deal the most important event for the Palestinians in 2011.
He said in a press statement that the KSA welcomes the unity deal and called on undersigning parties to swiftly form a unified government recognized by world powers.
"What is required now is increased efforts toward completing the building of a state of law and institutions, and pushing the world community to [end the Israeli occupation], and enable the Palestinians to practice their right of self-determination and establish an independent state of Palestine with Jerusalem as its capital,” the statement says.
Prince Talal rejected the ultimatum by Netanyahu that Fatah must either choose peace with Israel or Hamas.
"Netanyahu continues to use the usual tricks to avoid the obligations and requirements for peace. He has taken the [Palestinian] split as a means to cover the failure of negotiations.
What he wants is to deepen and perpetuate the split, and not vice versa,” he said.