Story highlights Car bomb explosion targets buses of people leaving their towns

At least 55 others are injured, group says

(CNN) The death toll from a bomb attack targeting evacuees leaving besieged Syrian towns has risen to 126, a monitoring group said Sunday.

The blast hit a convoy of buses Saturday, according to the Syrian Observatory for Human Rights, which reported the higher death toll.

The blast struck buses of people leaving their towns as part of a rebel-regime swap.

At least 109 of those killed were evacuees from the pro-regime Shia villages of Al-Fu'ah and Kafraya while the rest were aid workers and rebels guarding the convoy, according to the Syrian Observatory.

At least 68 children were among those killed in the attack on Saturday.

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