RavenSky
The Doctor's Wife
Richard Engel reported a couple of weeks ago that Isis had specifically sent over 30 fighters to Turkey to make a big splash during Ramadan. Seems it has come to pass, and there may be more. It seems like Isis is trying to destabilize Turkey as a route for many of it's fighters to get through to the caliphate and also to tip them over from officially secular to theocracy.
Even Marco Rubio was predicting an ISIS attack in Turkey: http://www.cbsnews.com/news/marco-rubio-predicted-terror-in-turkey-days-before-istanbul-bombings/
but I do find it interesting that they haven't yet claimed credit
I do highly respect Richard Engel's reporting, though