This is what I suspect. Maybe time for police to make deputies of citizens who each would be assigned a time slot to watch a known muslim home/business that also has a garage or place to hide a vehicle. I remember working for a bunch of goofs in Southfield MI (Columbia Nutritional Diet System) who followed a religious nut out west, Bhagwan, see this link
This was about 20 years ago...they had 200,000 followers and over 600 "safe" houses all over the world, these people traveled from house to house, this fact was used to try to get me to join - "look how you can travel for free with us" we often had people from other countries hanging around the office during their stay at local safe houses...I often wondered how many of them were hiding out at the time from something. I saw picture from the ranch with guys holding machine guns and my coworkers started signing up for trips to the ranch and came back with different names - one guy named Tom came back as Cheetah, another guy, the VP, came back as Veet, it was very freaky to see smart business people fall for this - they were after tax free statis as ministers in this at first but got brainwashed at the ranch as far as I could tell from their stories before and after the trips to the ranch.
I am sure Muslims have the same safe houses already set up too.
(I was not interested in their efforts to "convert" me - I was young and too busy partying - LOL - and eventually quit when they talked of mass suicide in case of bhagwans death -was the last straw for me!).
I think that the muslim groups, who are much bigger than that little cult I described, would definitely have safe houses and safe businesses for the sniper to hide out in...only a fool would think otherwise and having seen this type of system with my own eyes with that bhagwan cult, would hope the police and fbi are also on the ball on this.
The password is "God is great", confirm with "Peace be upon him", spoken in perfect Gulf Arabic.