College Students

The article mentions "The ATF began surveillance from a house across the road from the compound, but their cover was noticeably poor (the "college students" were in their 30s, not registered at the local schools, and they did not keep a schedule which would have fit any legitimate employment or classes)", however, there is no mention of the college students in question before this section, and there is no indication as to which "college students" it is referring to. Perhaps the people who were filming?