Syrian army forces backed by Iranian-backed militias, including Lebanon's Hezbollah, pushed deeper into the last rebel-held enclave near a strategic border area with Israel and Lebanon in a new expansion of Tehran's influence in the war-torn country.
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The army and the Shi'ite forces advanced east and south of the Sunni-rebel held bastion of Beit Jin backed by some of the heaviest aerial bombing and heavy artillery shelling since a major assault began over two months ago to seize the area, rebels said.
Haaretz reported last week the Syrian army and supporting militias have been gearing up to expand the area it controls in southern Syria near Israel's border and are likely to start their attack on rebel forces by the Syrian Mount Hermon. They may later attempt to advance southward, along Israel's border in the Golan Heights.
The Syrian army said it had encircled the village of Mughr al Meer at the foothills of Mount Hermon as troops moved towards Beit Jin amid fierce clashes.
The enclave is the last rebel bastion left in south west of Damascus that had since last year fallen under government control after months of heavy bombing on civilian areas and years of siege tactics that forced rebels to surrender.
"The Iranian backed militias are trying to consolidate their sphere of influence all the way from southwest of Damascus to the Israeli border," said Suhaib al Ruhail, an official from the Liwa al Furqan rebel group that operates in the area.
Worried by Iran's expanding influence in Syria after the defeat of Islamic State, Israel has in the last few weeks stepped up its strikes against suspected Iranian targets inside Syria.
Early this month an Israeli strike on a base near Kiswah, south of Damascus was widely believed to be an Iranian military compound, according to a Western intelligence source.
Israel has been lobbying both big powers to deny Iran, Lebanon's Hezbollah and other Shi'ite militias any permanent bases in Syria, and to keep them away from the Golan, as they gain ground while helping Damascus beat back Sunni-led rebels.
The southwest of Syria is part of a de-escalation zone in southern Syria agreed last July between Russia and Washington, the first such understanding between the two powers.