Surely they identified them and put them in the computer, right?
I hope so. A few weeks after 9-11 the cops went to see about some muslims target shooting at a gravel pit. They let them go as it wasn't illegal.
BUT - they put lots of surveillance on them, etc. Turns out they (7 or 8) flew over to the ME and tried to get into Afghanistan to fight with the muslims. They were turned back. When they got home they were arrested.