What We Know Deir al-Zour has been the scene of fierce fighting. Islamist rebels, including those linked to Al Qaeda, are strong there. Some have been implicated in sectarian attacks in nearby towns. Islamist groups have been at odds with each other in recent weeks over control of natural gas resources in the area.

What We Don't Know We do not know how many people may have been killed or injured in the blasts shown in this video. We do not know the identity of the cameraman or what his political affiliation may be. We do not know exactly what kind of munitions were used in these bombings.