The death toll from an attack on a rally of Turkey's pro-Kurdish People's Democratic Party (HDP) rose to four on Saturday, when a 65-year-old died from his wounds, the Dogan news agency said.

The June 5 attack on an HDP pre-election rally in the southeastern city of Diyarbakir, caused by a bomb stuffed with ball bearings, came two days ahead of the June 7 legislative elections in which the party scored a major breakthrough.

A Syrian rebel alliance has pushed Islamic State group jihadists further away from one of its key supply routes from neighboring Turkey, a monitoring group said Saturday. 

The Islamist rebels ousted IS from the village of Al-Bal, which it captured on Tuesday, threatening the Bab al-Salama border crossing, just 10 kilometers (six miles) away, the Syrian Observatory for Human Rights said.

A year after Islamic State jihadists overran much of Iraq, the United States and its allies are struggling to turn the tide against the extremists and their self-declared "caliphate."

As it tries to lead an unwieldy international coalition, Washington has pleaded for patience but has yet to arrive at a successful formula that can cripple the well-funded, opportunistic jihadists in Iraq and Syria.

Progressive Socialist Party leader MP Walid Jumblat condemned on Friday the attack against Druze in Syria's Qalb Lawzah, saying however that it was an “individual incident.”

He remarked: “Fiery statements regarding the incident will only jeopardize the Druze in Syria and I will tackle the tensions by holding a series of contacts.”

EU member Hungary threatened Friday to close its border with Serbia to stop an influx of migrants.

"We don't think it's right that they send us the refugees, they need to be stopped on Serbian territory," Hungary's Prime Minister Viktor Orban said in an interview on Kossuth public radio.

A member of the al-Qaida-affiliated al-Nusra Front group was arrested in the northeastern border town of Arsal for having links to various bombings that have taken place in Lebanon in recent months, reported the National News Agency on Friday.

Ahmed al-Atrash, also known as Nisr Arsal, was arrested by the army intelligence.

Hizbullah and the Syrian army continued their advances Friday on the outskirts of al-Qalamoun region, seizing control of several hilltops.

Al-Manar, Hizbullah's mouthpiece, reported that the party's fighters backed by Syrian troops captured Shouab al-Nasoub, Abou Harb and Semaan peaks, in a new blow to jihadists from al-Qaida-affiliate al-Nusra Front and the Islamic State group.

Syrian army troops regained full control of an airbase in southern Sweida province on Friday, a day after rebels overran large parts of it, a monitor said.

The Syrian Observatory for Human Rights said rebels from the Southern Front alliance withdrew from the Al-Thalaa base under heavy regime fire.

Army Commander General Jean Qahwaji expressed distress Friday over political tension in the country, saying it harms the institution, in particular the dispute over the appointment of high-ranking security and military officials.

Sources close to the army chief said in comments published in As Safir newspaper that Qahwaji warned that the political rift could distract the military, which is engaged in a combat against terrorism.

Progressive Socialist Party leader Walid Jumblat has held an emergency meeting for his party's leadership to contain the repercussions of the killing of at least 20 members of Syria's Druze community, al-Mustaqbal daily reported on Friday.

During the meeting that took place on Thursday, Jumblat called for calm to limit attempts to instigate against strife after a press conference that was held by Tawhid movement leader ex-Minsiter Wiam Wahab.