Akbik said Gen. Salim Idris, the Free Syrian Army commander, was in southern Turkey meeting with members of the Islamic Front to demand the return of the weapons.
There are conflicting stories over how the Islamic Front won control of the warehouses. The Islamic Front denies that it took the weapons by force, saying it was responding to a call for help from the Free Syrian Army after the group came under attack from unknown gunmen.
Akbik refused to give any details on what happened, saying the situation was "foggy," but said ammunition mostly AK-47 bullets and heavy machine guns were seized.
Despite the incident, Akbik said the opposition was still hoping to include Islamic fighters as part of their delegation to the Geneva peace talks in January, which aim to end the fighting that activists say has killed over 120,000 people in three years.
He said the opposition was "keen to form a delegation that will be as wide as possible" and that the Islamic Front was welcome to send a representative to the talks as part of the opposition delegation.
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