Palestine Liberation Organization (PLO) said on Sunday that the Israeli response to the political letter that Palestinian President Mahmoud Abbas addressed last month to Israeli Prime Minister Benjamin Netanyahu "didn't carry clear answers."

The PLO executive committee made the comments at a meeting chaired by Abbas in the West Bank city of Ramallah.

Yasser Abed Rabbo, Secretary General of the PLO's executive committee, who read the statement before reporters in Ramallah at the end of the meeting, said that "the Israeli response to the letter is unclear."

"The Israeli letter didn't include clear answers to central issues that obstruct the resumption of the stalled peace process, mainly settlement, which had recently increased, mainly in Jerusalem," said Abed Rabbo.

He added that the Israeli response to Abbas' political letter " didn't include clear answers to the recognition of 1967 borders as the borders of the future Palestinian state as well as to the issue of releasing prisoners from Israeli jails."

The executive committee called on the International Quartet, which comprises the United States, the European Union, Russia and the United Nations, "to strongly intervene to correct the track of the peace process."

The PLO condemned that Israeli government continues to make decisions related to largely keeping settlement construction in the Palestinian territories and in Jerusalem.

The statement stressed that settlement had been and will be always "illegal," warning that "Israel is deceiving the world and keep settlement activities, including the confiscation of lands, owned by the Palestinian people only."

On Saturday, Netanyahu's aide Yitzhak Mulkho handed Netanyahu's response to Abbas' political letter he addressed to Netanyahu on April 17 over the future of the stalled peace process in the Middle East.

The peace talks between Israel and the Palestinians had stopped in October 2010 due to disputes on Israel's insistence to keep settlement building in the West Bank and east Jerusalem.

The Palestinians insist not to resume any direct or indirect peace talks with Israel before the latter clearly declares a complete cessation of settlement activities in the territories occupied in 1967, including east Jerusalem.