Clashes between rebel groups, particularly pitting al-Qaeda-linked extremist factions against more moderate units, have grown increasingly common in recent months, undermining the opposition's primary goal of overthrowing Assad.
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The Britain-based Syrian Observatory for Human Rights said Saturday's fighting took place in the town of al-Boukamal between the al-Qaeda-linked Islamic State in Iraq and the Levant against more mainstream rebel groups.
Observatory director Rami Abdul-Rahman said the more moderate rebels used mosque loudspeakers Friday to demand the Islamic State in Iraq and the Levant leave Boukamal. When it was clear Saturday the ISIL had no plans to decamp, the mainstream groups attacked, Abdul-Rahman said. Three mainstream rebels and two ISIL fighters were killed in the clashes, he said.
It was not immediately clear what spurred the rebel demands for ISIL to leave Boukamal.
After months of growing tensions, infighting among Syria's mosaic of rebel factions broke into the open in July. For a time, the clashes contributed to a sense that the rebellion was faltering, and threatened to fracture an opposition movement that has been plagued by divisions from the start.
The moderates once valued the expertise and resources that the Islamic extremist brigades brought to the battlefield, and rebel factions of all stripes enter into occasional alliances for specific operations. But many of the moderates now question whether such military assets are worth the trouble -- not to mention the added difficulty in persuading the West to arm them.
To the south, the Observatory said government forces shelled the village of Ghadir al-Bustan, killing at least five people, including a child and a woman. The town is on the edge of the Israeli Golan Heights.
The area has witnessed clashes over the past days and shells have fallen in the past on the Israeli side.
In the central province of Hama, Syrian army warplanes bombarded a rebel post in the village of Aqeirbat, killing six opposition gunmen and wounding others, according to the Observatory. It said the village has been witnessing heavy fighting between troops and rebels.
The rebels in the area include members of the al-Qaeda-linked Nusra Front that attacked villages inhabited by members of Assad's minority Alawite sect, an off-shoot of Shiite Islam. Most of the rebels belong to Syria's majority Sunni sect.
In Lebanon, three rockets fired from Syria fell near the eastern town of Labweh, wounding two people and causing fire in the fields, the state-run National News Agency said.
Other rockets have hit areas where the militant Hezbollah group enjoys support since the group openly joined the battle in Syria along with Assad's forces.
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