ISIL's attack in Istanbul is a turning point - and more violence could follow

"While authorities have shown a capacity to disrupt networks within their country, they have faced numerous attacks in the past year. If Isil is turning it attention in a more focused way on Ankara, given the proximity to the group’s remaining Caliphate as well as the clearly substantial networks linked to the group that exist within the country, then it seems likely that more will unfortunately get through. "