The Russian center for Syrian reconciliation said that the first convoy of buses with militants has already left eastern Aleppo.
Meanwhile, the operation to evacuate 200 wounded is underway in the eastern part of the Syrian city of Aleppo, the Red Cross Syria said.
"In Aleppo, conflicting parties appealed to the the International Committee of the Red Cross (ICRC) and the Syrian Arab Red Crescent to help in the evacuation of the wounded," the Red Cross said.
Over the recent months, Aleppo became a major battleground in Syria between government forces and militants. On Tuesday, the Russian reconciliation center said that the Syrian government army was controlling over 98 percent of the territory of Aleppo, with militants present in less than 3 square kilometers (1.1 square mile).