The remains of dozens of Palestinians killed by Israelis in fighting following the 1948 foundation of the Israeli state have been found in a mass grave in Tel Aviv's Jaffa district.

An official at the Muslim cemetery there told Agence France Presse that the grisly find occurred on Wednesday when ground subsided as workers carried out renovations, revealing six chambers full of skeletons.

Thousands of people who have fled the besieged Syrian town of Qusayr are in dire need of aid, the U.N.'s refugee agency said Friday, as its tally for Syrians who have escaped their war-torn nation topped 1.6 million.

UNHCR spokesman Dan McNorton told reporters that at least 3,500 people -- mostly women and children -- had made it to the nearby town of Hasiya.

A British national has been killed in Syria, the Foreign Office confirmed on Friday, after a monitoring group said that Syrian soldiers killed three westerners.

"We understand that a British national has been killed in Syria. Their family have been informed and we are providing consular assistance," a Foreign Office spokesman said.

A group of doctors working in war-torn Syria said Friday its members had seen dozens of patients suffering from what they believe are chemical weapons attacks, saying the number seemed to be rising.

"We have dozens of cases of people hurt in what seems to be chemical attacks, especially civilians," Tawfik Chamaa, a founding member of the Union of Syrian Medical Relief Organizations (UOSSM), told Agence France Presse.

Four Mexican tourists were killed on Friday in a fiery road accident in Egypt's Sinai Peninsula, South Sinai's governor told Agence France Presse, with police and medics putting the toll at six.

Seventeen tourists, all Mexican, were injured in the crash, governor Khaled Fouda told AFP, adding that two were in critical condition.

The International Criminal Court on Friday rejected Tripoli's bid to halt its prosecution of slain leader Moammar Gadhafi's son Seif al-Islam for crimes against humanity committed while trying to put down Libya's bloody revolt in 2011.

"The chamber concluded that it has not been sufficiently demonstrated that (Libya's) domestic investigation (covers) the same case that is before the court," the Hague-based ICC said in a statement on the long-awaited decision.

U.S. Secretary of State John Kerry said Friday that Russia's planned delivery of S-300 air defense missiles to Syria is "not helpful" for efforts to convene a peace conference.

Kerry's comments at a news conference with German Foreign Minister Guido Westerwelle came ahead of a preparatory meeting in Geneva next week on a U.S.-Russian bid for talks to end Syria's two-year-old civil war.

The United Nations Security Council on Friday added the Syrian militant group Al-Nusra Front to its global sanctions list because of its links to al-Qaida.

The group, a feared force battling President Bashar Assad, is now subject to an international asset freeze and arms embargo, according to an announcement made by the Security Council's al-Qaida Sanctions Committee.

France wants to work with Libya against militant groups on its territory but will not take military action in the country without U.N. backing, President Francois Hollande said on Friday.

Asked about media reports of France preparing an intervention against Islamist groups in southern Libya, Hollande told interviewers from broadcasters France 24, RFI and TV5Monde there were no plans in the works.

Three European women with radical activist group Femen, who were arrested after baring their breasts in Tunis, will be tried next week for public indecency and could be jailed, their lawyer said Friday.

"They will appear in court in Tunis on June 5... The trial will be an open hearing," Souheib Bahri told Agence France Presse, information confirmed by French consular officials in Tunis.