The use of VBIEDs and suicide bombings is almost entirely a ‘Free Syrian Army’ and Al-Qaeda tactic in Syria, and they commonly post videos to glorify the acts of destruction in public arenas. The ‘Free Syrian Army’ itself has confirmed that this was due to an explosive device in a vehicle.
This may therefore have been an explosion of one of their own by mistake, and no party has claimed responsibility. There have been several incidents of premature explosions killing the owners in their vehicles or hideouts.
Muslims killing Muslims again. YAWN.
PART 1 (Graphic stuff starts around 1:05)
H/T Don L