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The largest Islamist rebel force in Syria seized arms depots belonging to the mainstream Western-backed Free Syrian Army on Saturday, a watchdog said, highlighting tensions among rebel groups.
"After combat that lasted all night, fighters from the Islamic Front captured (FSA) general staff positions near the Bab el-Hawa border crossing (with Turkey) and seized their arms depots," the Syrian Observatory for Human Rights said.
The Observatory said the arms had been brought across the border from Turkey and that five fighters were killed, but it did not say from what side.
The seizure comes four days after the Islamic Front announced that it rejected the authority of the FSA command.
The FSA was the first organised rebel military entity to emerge after peaceful demonstrations against President Bashar al-Assad in 2011 degenerated into an armed uprising.
It was made up of army deserters and civilians.
Since then, numerous other groups have emerged, many of them Islamist, which are operating with a high degree of autonomy from the FSA if not totally independently.
The Islamic Front was formed last month when six groups merged and pledged to work toward formation of an Islamic state.
Syria's civil war, which has killed more than 126,000 people and displaced millions, has become more complicated as jihadist and other rebel groups battle not only Assad but, increasingly, each other.
In violence elsewhere on Saturday, at least 12 civilians -- among them women and children -- were killed in air raids on the jihadist-held northern town of Raqa, the Observatory said.
It also said the civilian toll from Friday air raids on another northern town, Bezaa, had risen to 20, among them eight children and nine women, one of them pregnant.
A fighter with Lebanon's Shiite Hezbollah, which is fighting alongside Assad's forces, was killed on Saturday in Nabuk, one of the last rebel-held areas of the strategic Qalamoun area bordering Lebanon.
Taking this region would cement regime control of territory linking Damascus province with Homs province to the north.