At least 68 children were among those killed in the car bomb attack on a convoy carrying evacuees from besieged government-held towns in Syria, according to a monitor.

Yesterday’s attack in Rashidin, west of Aleppo, killed at least 126 people, according to the Britain-based Syrian Observatory for Human Rights.

At least 109 of those killed were evacuees from the towns of Fuaa and Kafraya, it said, while the rest were aid workers and rebels guarding the convoy.

Syrian rescue workers from the Civil Defence earlier said that they had taken away at least 100 bodies from the site of the blast.

The explosion hit buses carrying Shia residents as they waited to cross from a rebel-held region into government territory in an evacuation deal between warring sides.

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Syria's main armed opposition condemned the bombing, with groups fighting under the banner of the Free Syrian Army describing it as a "treacherous terrorist attack".

Pope Francis, in an Easter message, also condemned the attack, describing it as "ignoble", and asking God to bring healing and comfort to what he called the "beloved and martyred Syria".

The convoy was carrying at least 5,000 people including civilians and several hundred pro-government fighters, who were granted safe passage out of the two Shia villages which are besieged by rebels.

Under the evacuation deal, more than 2,000 people, including rebel fighters, were granted safe passage out of Madaya, a town near Damascus besieged by government forces and their allies.

That convoy was waiting at a bus garage in a government-held area on Aleppo's outskirts, a few miles from where the attack took place. Madaya evacuees said they heard the blast.