I remember laughing at the presented passport from one of the alleged culprits shortly after.(Like a day, or even hours? Can't recall exactly anymore) Found blocks away, only slightly burned at some parts of the corners. Seemed surreal and staged to me.

edit: Also, in hindsight, after having been sensitized to the topic in general, the fact that there were exercise/drill/training/simulation operations running at the same time and place where terror attacks hit.