This was filmed in Damascus, Syria by the Fake Syrian Army movie production faction. It shows the insides of a car with two completely torn up bodies. I think it’s pretty clear that they died in an explosion, but unfortunately I do not know for sure what caused it.
It’s quite possible that they were suicide car bombers as this type of activity is very common among the terrorists and various sites in and around Damascus are their primary targets. However these could also be civilians killed for shits and giggles since FSA have such a massive supply of weapons.
You can see some of the weapons seized in Homs in the second video. These ere provided to the terrorists by their primary sponsors – Israel and NATO. The Israeli supplied weapons included mortars, anti-armor missiles and hand grenades. NATO supplied weapons included anti-tank mines, US sniper rifles, Belgian FN FAL machine guns and RPG rockets.
Video of weapons seized after an armed faction of FSA terrorists was exterminated in Homs: