Today we finally have very strong debris evidence from one of these attacks. Videos and photographs from the village of Belioun in Jabal Zawiyeh shows the remains of a weapon that reportedly landed outside the village. My understanding is this village has not been the scene of fighting for many months, and only occasionally sees attack from air. Here are the video and photographs from the village (thanks to Al'Thowra Souria for providing these images)
The 3rd photograph allows us to easily identify the weapon used. The markings read "9Д19TC" and "9M21TC", with 9M21 referring to the rocket used by the 9K52 Luna-M/FROG-7 short-range artillery rocket system, and the 9Д19 referring to the solid propellant booster used as part of the 9M21. It's likely the string of 3 numbers under each of those markings refer to the batch number, factory, and year of manufacture of the booster and rocket, putting the year of manufacture as 1983. The 9M21 rocket has a range of 70km and a circular error probable of 500-700m. It can carry a 500kg high explosive warhead, as well as a chemical or nuclear warhead.
To my knowledge this is the first time we've had identifiable debris evidence of these kinds of large rockets being used on civilian populations, and that's not the only video seen today showing possible evidence of these rockets. This video was also posted showing as yet unidentified remains of another weapon used in Syria
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