Whether the attack was “planned” seems to have become a major issue. Yes, it was planned in the sense that the Islamist militia did not arrive simultaneously with their weapons by accident.
The planning could have consisted of some hurried phone calls and basic instructions to various militia cells once the terrorist leaders realized the opportunity.
How far in advance, how elaborately, and how much and how soon State could have known about it are all open to speculation. That speculation is being selectively presented as fact and the truth is lost in the haze.