The Palestinians are urging the United Nations to pressure Israel to allow Palestinian refugees caught in the Syrian conflict to travel to the West Bank and Gaza.

Palestinian U.N. Ambassador Riyad Mansour said Israel's "intransigence can neither be accepted nor justified" and should not be allowed "to prevent us from bringing our refugees to safety in their own homeland."

He said in identical letters Tuesday to the Security Council, General Assembly and secretary-general that at least 480,000 Palestinian refugees remain in Syria, with more than half displaced from their refugee camps and 95 percent in need of humanitarian assistance.

Mansour urged the U.N. and the international community to support the effort to bring the refugees to the Palestinian territories "as a matter of humanitarian, moral and political urgency."