"We hope (US Secretary of State John) Kerry's efforts will be renewed in the coming days," Yasser Abed Rabbo, secretary general of the Palestine Liberation Organisation's executive committee, told reporters in Ramallah.
"Kerry knows the reality. We don't want these efforts to finish."
Late yesterday, Palestinian president Mahmud Abbas said he had begun steps to join 15 UN agencies, angering Israel and prompting Kerry to cancel a trip to Ramallah today.
The announcement was a blow to Kerry's frenetic efforts to resolve a dispute over Palestinian prisoners and find a way to extend the fragile peace talks beyond a looming April 29 deadline.
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But Israel says its release of each batch of prisoners was conditional on progress in negotiations, which is not currently evident.
"The government of Israel did not release the prisoners, without any reason or even any excuse for not doing so," Abed Rabbo said.
The senior Palestinian official suggested that they would not be quitting talks before the deadline.
"The Palestinian leadership respects its commitments and wants the political process to continue, but we want a real political process, without tricks," he said.