[Indie]

An interpretation from the arabic on another post said 90% was a metaphorocal way of saying "plan IS completed already" and the other 10% is the attack itself.

[freeperfromnj]

the other 10% is the attack itself.

That does make some sense. The operatives could already be here and ready to go. European intelligence certainly didn't see the carnage in Spain coming. I just hope we're ready.