Two members of the Palestinian group Fatah were killed in clashes with Islamist groups in a Palestinian refugee camp in Lebanon on Wednesday, medical sources said, bringing the number of dead to six in nearly a week of fighting.

Lebanon's army said Tuesday it had captured most of a mountainous area on the border with Syria during an operation to clear Islamic State group jihadists from the region.

Lebanon helped foil an alleged Islamic State-inspired plot to blow up a plane travelling from Australia to the United Arab Emirates this month, its interior minister said on Monday.

The Lebanese army announced Saturday the start of an offensive against the Islamic State (IS) group close to the Syrian border in the east of the country, where jihadists have been operating for several years.

Clashes between Palestinian security forces and Sunni Islamists in Ain el-Hilweh Palestinian refugee camp in Lebanon left two people dead, a Reuters witness said.

The leader of Lebanon's Hezbollah said on Sunday the administration of US President Donald Trump had no way to harm it, dismissing US sanctions and threats targeting his Iran-backed group.

Syrians who left Lebanon after a ceasefire between Hezbollah and Nusra militants on Thursday started crossing into a rebel-held area of Syria where they will settle, Lebanese media reported.

Buses carrying Syrian militants and refugees left a Lebanese border area bound for a rebel-held part of Syria on Wednesday, under a deal made after Hezbollah routed Islamist Nusra Front insurgents in their last foothold at the frontier.

A convoy of buses was deployed on Monday to transport Nusra Front militants and refugees from Lebanon's border region to Syria in exchange for Hezbollah prisoners.

Fighting between Lebanon's Hezbollah movement and a former Al-Qaeda affiliate on the Syria-Lebanon border halted on Thursday after a ceasefire was reached, Lebanese media and Hezbollah outlets reported.

Fighters from the Lebanese Hezbollah movement on Saturday made further progress against militants on the second day of a military operation near the border with war-torn Syria, Lebanon's official National News Agency reported.

Lebanon's powerful Hezbollah group said on Friday its fighters had begun an operation against militants on both sides of the country's border with Syria.