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At least 25 buses entered besieged neighborhoods to evacuate rebel fighters and civilians from eastern Aleppo Sunday, Syria's official news agency says — but that was before an attack on buses elsewhere put all movement on hold.

The setback comes after the evacuation effort was halted Friday after just one day, with all sides lobbing accusations at each other.

Evacuations of embattled eastern Aleppo, which began Thursday after days of efforts to negotiate a cease-fire, have come to a halt.

Thousands of civilians and fighters have already been evacuated from the rebel-held enclave: Some 3,000 civilians were evacuated in the first few convoys, along with more than 40 wounded people, the International Committee of the Red Cross said Thursday.

The aid group anticipated it would take days to fully evacuate east Aleppo.

After years of devastating war, days of increasing desperation and the collapse of one cease-fire, evacuations are underway in besieged eastern Aleppo.

Live images on Syrian state TV showed ambulances entering the rebel-held enclave on Thursday morning to evacuate the wounded. Aid groups confirm that evacuations have begun — despite reports of a brief burst of gunfire targeting ambulances.