Update December 19th Thanks to @massdall for this video which gives a clear view of the booster described above.
In the past week there's been numerous reports in the press of claims by US and NATO officials of Scud missiles being fired at opposition forces in Syria. Since then a number of videos have been posted online claiming to show Scud missile launches, but none have been clear enough to make a positive ID, for example
The Syrian military has a variety of tactical ballistic missiles including Soviet, North Korean, and Iranian missiles, so it cannot be assumed these launches are Scud missiles.
Today two videos were posted online showing the remains of a large missile, possibly the first example of tactical ballistic missile remains being filmed in Syria
The missile is covered with Russian text, but the markings don't give much useful information, with most of it appearing to be basic technical information and information about the correct method of transport, none of which provides enough detail to make a positive ID. As the text is in Russian it means the following missiles used by the Syrian military are the most likely suspects
Evidence Of New Grad Launched Cluster Munitions Used In Syria
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Unexploded Bombs Used In A Truck Bomb By Jabhat al-Nusra
Clear Evidence Of DIY Barrel Bombs Being Used By The Syrian Air Force
Unexploded Cluster Bomblets Repurposed As DIY Rocket Warheads
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