That convoy was waiting at a bus garage in a government-held area on Aleppo's outskirts, a few kilometres from where the attack took place.
An explosion near a bus convoy waiting to enter the Syrian city of Aleppo killed or wounded several people on Saturday, pro-government media outlets, pro-opposition activists and a monitor reported.
According to Tasnim dispatches, over 118 evacuees from the Shiite-populated towns of Foua and Kefraya were killed when a suicide bomber blew himself off near the buses at a transit point west of Aleppo Saturday.
Syrians who arrived a day earlier from government-held vilages of Fuaa and Kafraya wait in rebel-held Rashidin, west of Aleppo city, following delays in evacuating them as the hard-won deal ran into trouble on April 15, 2017.
Saturday's bombing comes within just weeks of another deadly attack involving children in Syria.
Those killed were mostly residents of the villages of al-Foua and Kefraya in Idlib province, but included rebel fighters guarding the convoy, the Observatory added.
President Bashar Assad's government blamed the attack on rebels.
About 100 people were killed Saturday April 15 in a vehicle bomb explosion targeting pro-regime evacuees leaving besieged Syrian towns, a volunteer rescue agency said.
The United Nations is not overseeing the transfer deal of the villages of Foua and Kfraya, besieged by rebels, and Madaya and Zabadani, encircled by the government.
Russia's Anna-News military news service, which employs the journalists, said one was wounded in the arm while the other suffered leg and stomach wounds. People walked outside the buses, surveying the damage as well as bodies lying on the roadway and a grass median. Rebels say they have been forced out by siege and bombardment.
They are also causing demographic changes because those who are displaced are usually Sunni Muslims, like most of the opposition.
The exact reasons for the delay in completing the evacuation deal were also unclear. The group said it is investigating the blast to try to determine who was responsible. "My house, land and belongings are all in al-Foua", Mehdi Tahhan said. "Numerous buses were totally destroyed", he said.
Abdul Rahman said he doesn't believe the Syrian regime is behind the attack. The buses headed to the Jebrin area for a temporary housing center equipped with food and medical supplies, SANA said. However, Assad and most of his supporters are of the Alawite religious minority, often considered an offshoot of Shi'ite Islam.