The leader of Lebanon's Hezbollah said on Thursday it had captured much of an Islamic State enclave on Syria's side of the border with Lebanon, in a joint offensive with the Syrian army.

In parallel with the fighting, talks on a truce deal have begun with Islamic State, but a military victory is more likely, Sayyed Hassan Nasrallah said in a televised speech.

Iranian-backed Hezbollah and Syrian troops have been fighting since last week to oust Islamic State militants from Syria's western Qalamoun region.