Syrian rebels on Sunday seized the training camp of a pro-regime Palestinian faction near Damascus after fierce clashes, a watchdog reported.

"Rebels stormed a Popular Front-General Command (PFLP-GC) training camp in the Rihan area of Damascus province, after violent clashes with local fighters," according to the Syrian Observatory for Human Rights.

Foreign Minister Ahmet Davutoglu admitted on Sunday that Turkey had resumed contacts with Israel to try to bring an end to the hostilities in Gaza, despite its decision to freeze diplomatic relations with the Jewish state.

"In the Gaza process, it's true, Israel held discussions with Turkey through foreign ministry and secret service channels," Davutoglu said in a televised interview, quoted by the Anatolia news agency.

Tens of thousands of Moroccans marched in support of the Palestinians in the country's two main cities on Sunday, after Israel's devastating eight-day bombardment of the Gaza Strip.

Protesters in Rabat, who numbered more than 45,000 according to police, condemned Israel for "crimes against humanity" during the assault that killed more than 160 Gazans, and criticized Washington for supporting the Jewish state.

British Foreign Secretary William Hague urged the United States on Sunday to take a "decisive lead" on reviving the Middle East peace process following the deadly conflict in Gaza.

Following President Barack Obama's re-election this month, "we do look to the United States to give a decisive lead in the coming months," Hague told BBC television, adding: "They have crucial leverage with Israel that no other country has."

Gaza's ruling Hamas movement is to release all prisoners from the rival Fatah movement detained in connection with the political dispute between them, a spokesman said on Sunday.

"The Hamas government has decided to pardon all cases against Fatah members which are related to the internal division since 2006," Hamas government spokesman Taher al-Nounou said at a press conference in Gaza City.

A Palestinian resident of east Jerusalem has been arrested on suspicion of being an agent of Hizbullah, Israel's domestic security agency Shin Bet said on Sunday.

Issam Ali Hashem Mashahra of Jabel Mukaber was arrested on Saturday on suspicion of acting as an agent for Hizbullah, after being recruited during a visit to Lebanon in June 2012, a statement said.

Palestinian President Mahmoud Abbas on Sunday said he was "fully confident" ahead of a fresh attempt to seek upgraded Palestinian status at the United Nations on November 29.

"We are going to the U.N. fully confident in our steps. We will have our rights because you are with us," he told a crowd of around 1,000 people demonstrating support for the bid to upgrade the Palestinian rank from that of an observer entity to an observer state.

Palestinian cars were vandalized overnight in Israeli-annexed east Jerusalem, in an attack that bore the hallmarks of a hate crime by rightwing Israeli extremists, victims and police said on Sunday.

Eight vehicles belonging to the same family had their tires slashed, and one was daubed with the slogan in Hebrew reading "Price tag Gaza," suggesting the vandalism was a response to massive Palestinian rocket fire during the recent Gaza flareup.

The body of Palestinian leader Yasser Arafat will be exhumed on Tuesday to undergo poison tests, the head of the Palestinian inquiry team said on Saturday.

"The tomb will be opened on November 27 and experts will take samples the same day within a matter of a few hours," Tawfiq Tirawi told reporters in the West Bank city of Ramallah.

A Palestinian was shot dead by Israeli forces near the Gaza border on Friday, the first casualty since the two sides agreed a truce ending their week-long conflict, Palestinian medical sources said.

An Israeli army spokeswoman could not confirm the incident, saying only that "disturbances" had broken out on the Palestinian side of the Gaza border early on Friday, prompting Israeli soldiers to fire warning shots.