How a modern-day massacre happened — and why America sat on the sidelines.
In December, after an extended siege and a month of intense fighting, Bashar al-Assad’s forces seized control of the rebel-held eastern half of Aleppo. A withdrawal agreement allowed thousands of rebels and civilians to evacuate — but not before Assad’s forces massacred and tortured an unknown number of people. The Assad victory was a humanitarian disaster and a devastating blow to the embattled anti-government rebels — and something that was in the works for over a year. The above video explains why.