In regard to 9-11, (written 11-9 Euro style) 11 represented many things...the date, two primary targets; NY & DC, the Order of operations - Two towers first and DC second. 11-9 also represents the time...i.e., between 9 & 11 AM.
The way I figure it, the 6 who showed up at school are "watchers"....folks that do computer work, take photographs (they are tourists after all, get into the mainstream and monitor the news. The college gives them computer access.
Also think there are a couple more who arrived before this group. They would be the brains...the coordinators. This little news story bothers me.
Write 6-11 on a piece of paper. Turn the paper 180 degrees.