Also note that (a) several of the 9/11 hijackers (starting with Nawaf Alhazmi and Hani Hanjour) made their phoney Virginia ID connection at Dar al-Hijra mosque; that (b) the address used on those 9/11 phoney ID's was 5913 Leesburg Pike, Falls Church 22044, an address less than one mile east of Dar al-Hijra (which is also on Leesburg Pike); (c) that Malvo/Muhammad were stopped several times and at several locations along Leesburg Pike during their October spree (if I recall from Tysons Corner all the way east to the Leesburg Shopping Plaza at South George Mason Drive).
As an aside, it's remarkable that every time there is another incident involving Dar al-Hijra, it members, or its imams, that these are identified in the press as "a Northern Virginia mosque." Turn over the rock, and you're right back at the epicenter of 9/11, Malvo/Muhammad, and Wahabbist activity in Virginia.
By the way, I've posted before that Dar al-Hijra is in equally close proximity to the office of the World Assembly of Muslim Youth (formerly run by OBL's brother) and had on its board at least once banker to Osama bin Laden.
That San Antonio radiologist that was held after 9/11 was associated with that World Assembly of Muslim Youth, wasn't he?