'b' has this to add "...
"Important to note: Turkish bill for authorizing force deployment was dated September 20. Erdogan knew trouble lay ahead."
The FSA insurgents captured the border crossing point Tal Abyad right next to the town Akçakale on September 19 to build a supply line for their attack on the city of al-Raqqa. A day later Erdogan prepares a bill giving him war powers. This certainly increases the suspicion that this was a false flag attack with the purpose of getting Erdogan war powers./end update/