The fall of Yabroud immediately emboldened government forces to attack nearby rebel-held towns, pressing forward in what has been nearly a yearlong advance against rebels fighting to overthrow President Bashar Assad.
Support from the Iranian-backed, Shiite Hezbollah appears to have tipped the balance in the border area, even as it has partly prompted the conflict to bleed into Lebanon where it has ignited polarizing sectarian tensions between Sunnis and Shiites.
Yabroud was an important supply line for rebels into Lebanon, and overlooks an important cross-country highway from Damascus to the central city of Homs. It the last major rebel-held town in the mountainous Qalamoun region, where Assad's forces have been waging an offensive for months to sever routes across the porous border.
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"Our armed forces are now chasing the remnants of the terrorist gangs in the area," said a uniformed soldier reading a statement on Syrian television. "This new achievement ... cuts supply lines and tightens the noose around terrorist strongholds remaining in the Damascus countryside," said the soldier.
Syrian officials refer to rebels as "terrorists."
A spokesman of the Islamic Front, a rebel coalition, said fighters fled the hills that overlook Yabroud before Syrian army troops entered. Captain Islam Alloush said other rebels later fled Yabroud overnight, collapsing the ranks of fighters.