First you could easily locate every suitcase nuke held by the ragheads. It would be underneath the mushroom cloud. Second there may be 5 sleeper cells. Maybe 50 at the outside. 5000? NO WAY! You just can't keep that many people together in any covert way. Once there is more than one person involved things fall apart.
How many Fina & Shamrock convience stores do you have in your area? There is a bunch in mine. Most are owned/staffed by ME's. Several that I go into have a laptop sitting on a back counter with Arabic pages showing. I have gone in at times and once I step foot into the store, the laptop would be closed.
I don't/cannot read Arabic. How is that for covert? Right in front of us?