Yes, report your concerns and report the activity. All agencies (Homeland Sec., FBI) allow you to report anonymously if that helps. Since the muslim neighbors activity was suspicious enough to cause you to relocated I hope you reported it once you moved. The authorities can't be expected to stop every bad guy by stumbling onto them via dumb luck.
Well, no, I didn't report it to anyone officially although I certainly wanted to. And, yes, it was more than enough to cause me to move somewhere else...it really disturbed me and especially because there were ever changing male "Middle Eastern" adults arriving and departing and their combinations would change over time, as if two lived there for a few months, then another few would replace them...not a family, is my point, particuarly since the house was occupied initially by a single woman with two children. The males showed up later and seemed to be coming and going without the actual residents. I know the female was muslim because her son stopped and visited with me once and talked about it, that his father was muslim but was not married to his mother, that his mother was muslim, and started explaining their "eye" insignia that he said they had inside the front door, all that.
The woman, the only time I ever visited with her (new neighbor, was being polite, but stopped interacting with her altogether afterward), said she was originally from "Guatamala" -- was very tall and olive featured and not at all Hispanic in appearance but resembled more females I've seen from the Arab world -- anyway, she said she was from "Guatamala" but her son spoke with a slight accent I didn't recognize, and then the various males in twos began appearing...
It was a very uncomfortable and strange aspect to a once peaceful area and it gave me the creeps and I really just didn't want to live near to that. Thus, I moved away. The woman became very aggressive towards me when I stopped visiting with her out side and actually vandalized my outofdoor plants the night before I moved away...very odd...tipping them all over in anger for unexplained resentments.
There's also a large mosque near to that area, just a few blocks away, actually, now that I think back over this.