But the West is wary of such groups, and U.S. officials have said the Obama administration is preparing to designate the Jabhat al-Nusra group, which has alleged ties to al Qaeda, as a terrorist group.
The Observatory said the rebels seized key sectors of the base, home to the 111th Regiment, including its command center.
About 140 Syrian troops fled to a nearby base as the rebels advanced, Mr. Abdul-Rahman said, adding that opposition fighters captured seven government troops and killed two soldiers in the fighting.
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