I was just noting that the number of days between terrorist attacks is almost certianly purely concidence. You can link any two incidents in history though the practice of numerology.
If it turns out to be Islamic fundy related, this might be the strangest thing.... in the Islamic Calendar, 9/11/01 is 6/22/1422 the 22nd day of Jumada II, while 3/10/04 becomes 1/18/1425; the 18th day of Muharram.
Other than date conversion between 2 calendars, I cannot find any numerological relationship, of course I do not think I will try..