Couple with this that there is an Islamic Center/Mosque near the Falls Church ....Fredericksburg.....Manassas.. shootings...
WOW!
The presence of mosques and other places of Islamic worship do not indicate in and of themselves locations where the sniper(s) would seek refuge. I think our sniper would act as directed by the Al Qa'eda handbook and go to a "brother's apartment" (house). The presence of worship centers, however, usually indicates a population nearby that can sustain the center - meaning there would be a substantial number of "brother's apartments" available to spirit these individuals away for a few hours or so.
That's my takeaway.