I'm in a wait & see mode. The roommate and the cache of explosives are variables that need investigating. I'm not sure this constitutes a "cell" as such. More likely it's liberal brainwashing and student protests taken to extremes with a bit of Jihadi false promises about their version of the afterlife. I don't think these stupid kids were acting on orders. I do however, worry about copycats across the country. The University of Miami is a sizzling hotbed of islamic extremeism. I have seen it firsthand. I mean, look who the Chancellor is: Donna "Boom-Boom" Shalayla!
If he and his Pakistani roommate had connections to the local mosque and lots of bomb making materials and jihad books, I tend to think it that is was coordinated on some level - just as the London bombings were.