FSA propaganda team says that this massacre happened to do shelling of a public market in Alkorah City, Syria. I’m not an expert, but I’d expect some kind of crater and collapsed walls if a shell was dropped on that area. To me the massacre looks more in line with suicide bombing whereas a bomber wore a suicide vest laced with explosives and set it off when surrounded by enough people.
I don’t believe any claims made by the terrorists. They’ve been full of shit right from the start.