The battle for Aleppo has not yet begun, and shelling by troops is just the start of what is to come, a senior Syrian security official in the region said on Saturday.
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"The battle for Aleppo has not yet begun, and what is happening now is just the appetizer," the official told AFP on condition of anonymity, adding: "The main course will come later."
The official said new military reinforcements had arrived, and that there were at least 20,000 troops on the ground.
"The other side are also sending reinforcements," he added, referring to the rebel forces.