was underway on December 19, a day after armed opposition militants attacked evacuation buses en route to begin the process.The UK-based Syrian Observatory for Human Rights said that Fatah al-Sham supporters set fire to buses that were due to enter the predominantly Shiite towns as part of an evacuation deal brokered with opposition forces. Syrian state media accused Ahrar al-Sham and Jabhat al-Nusra of carrying out the attack, though Storyful cannot confirm this. Evacuations continued in Aleppo on December 19, where thousands of people in rebel-held neighborhoods were awaiting transfer out of the conflict zone. Credit: YouTube/Shaam News Network via Storyful">