Residents in eastern Aleppo started to board buses and ambulances as the long-awaited pull-out from the last rebel enclave in the embattled Syrian city got under way.
The evacuation is part of a ceasefire deal reached this week to have the opposition surrender their last foothold in Aleppo to Syrian government control in the face of a devastating ground and air offensive by government forces in the past weeks that chipped away at the rebel enclave.
The rebel pull-out will mark the end of the rebels' four-year control of eastern Aleppo.
Hundreds of civilians have been killed and tens of thousands displaced in the government's campaign to retake Aleppo.
Plans to evacuate on Wednesday were scuttled when the area erupted in violence, raising the haunting possibility that all-out war could consume the city again. Much of eastern Aleppo has been reduced to a scene of devastation and rubble.
Earlier on Thursday, the International Committee of the Red Cross confirmed its staff arrived together with the Syrian Arab Red Cross to evacuate 200 wounded people from the enclave, some in critical condition.
Syrian state TV has broadcast footage showing a convoy of green-coloured municipal buses rumbling toward the agreed-on evacuation point inside the opposition-held area. The Russian military, a staunch Assad ally, said 20 buses and 10 ambulances would take the rebels to the rebel-held areas in the province of Idlib later on Thursday.
The Russian military said the government in Damascus had given security guarantees to all rebels willing to leave Aleppo and that the Russians were monitoring the situation using drones.
Separately - but in a key addendum to the deal - Syria state TV said 29 buses and ambulances were heading to two Shiite villages besieged by rebels to evacuate those critically ill and other humanitarian cases. The TV quoted Hama provincial governor, Mohammed al-Hazouri, as saying that the medical teams were heading to Foua and Kfraya for those evacuations.
The Turkey-Russia brokered truce-and-evacuations deal for Aleppo was held up on Wednesday over demands by Syrian government allies to evacuate the sick and other humanitarian cases from the two villages.
A rebel spokesman involved in the negotiation over Aleppo evacuations said that Iran had made the demands about the Shiite villages besieged by rebels at the last minute, holding up the deal.
Lebanon's militant Hezbollah group said overnight negotiations had reinforced a ceasefire deal to allow the rebels and civilians to leave eastern Aleppo. Shiite Hezbollah militiamen are fighting in the Syrian civil war on the side of President Bashar Assad's forces.
The handover of Aleppo's remaining opposition-run neighbourhoods to government control would be a turning point in Syria's civil war, allowing Assad control of most of the country's urban centres.
The Britain-based Syrian Observatory for Human Rights said the fighting stopped in the city around 4am local time on Thursday.
Initially, the evacuation from Aleppo was to have begun at dawn on Wednesday, but quickly derailed, descending into terrifying violence. Residents said government buses arrived in the pre-dawn hours at agreed upon meeting points, where the wounded were first in line to be evacuated after surviving weeks of intense fighting amid destroyed medical facilities and depleted supplies.
But they were turned away by Shiite pro-government militias manning the checkpoints. Then violence erupted: shelling and then air strikes. The rebels retaliated, at one point shelling the pro-government villages of Foua and Kfraya in Idlib and detonating a car bomb in a frontline area.
Residents, activists and medical staff described mayhem as volleys of shells rained down on the area where tens of thousands of civilians were trapped alongside rebels in gutted apartment buildings and other shelters.
On Thursday, a Syrian army official said all preparations are ready for the evacuations.
"The evacuations will begin at any moment," he said.
