RAMALLAH — Palestinian leaders have rejected an Israeli proposal to extend the crumbling peace talks beyond April 29, saying it was akin to “blackmail,” an official in Ramallah told AFP on Monday.

“Israel is practicing a policy of blackmail and linking its agreement to releasing the fourth batch of prisoners with the Palestinians accepting to extend the negotiations,” the official said following a late-night meeting in Jerusalem between the two negotiating teams.

His remarks were made as US Secretary of State John Kerry was heading to Israel from Paris in a bid to prevent the collapse of the crisis-hit talks.

US peace efforts took a major blow at the weekend when Israel refused to free a group of 26 veteran Palestinian prisoners under an agreement which brought the sides back to the negotiating table in July 2013.

The Palestinians say that unless the prisoners are freed, they won’t even discuss a possible extension of peace talks, but Israel has refused to release the detainees without first securing a Palestinian commitment to continue the talks beyond April 29.

“Israel made a proposal which was refused by the Palestinians,” the official told AFP, describing the proposal as “weak.”

In exchange for Palestinian agreement to continue the talks, Israel had offered to free the fourth batch of detainees and to releasing another 420 others.

But that number would only involve those serving light sentences for minor offenses and would not include sick detainees, nor women and children.

And it would not include any heavyweight political names such as Marwan Barghouti, who masterminded the second Palestinian uprising, or Ahmad Saadat, head of the Popular Front for the Liberation of Palestine.

The Palestinians are understood to have several conditions for extending the talks with Israel, including the release of more security prisoners and a freeze on Israeli settlement construction which has continued freely over the past eight months of talks.

“The proposal includes a partial settlement freeze in the West Bank but excludes East Jerusalem, and would include continued building in areas where tenders have already been published,” he said.

He accused Israel of trying to string out the negotiations indefinitely while continuing to build facts on the ground.

“The Israeli proposal aims to continue the negotiations indefinitely, without any results, in parallel with continued settlement building,” he charged.

“It’s a very difficult situation and the peace process is in real danger because of Israeli policy.”