Must say, security seemed pretty tight at IST recently, at least once in the terminal. Checks entering the building, then twice more as people go through the terminal. We had a security escort to the gate (actually we were also escorted through upon arrival). Our aircraft was also being protected by five security guards, three of which checked my ID while doing the walkaround. However far back you take the security perimeter, there's always going to be something to attack and somewhere people will congregate before getting through the first security checkpoint.
Anyway, terrible news. It's a pretty horrendous situation.