I live in Houston and actually take classes at Lone Star College (not this campus) and just from watching all the local news channels, this all appeared to have happened around the library and stemmed from an argument between a group individuals. One local news channel has a banner reporting "4 people hurt, 2 in custody."
While a school shooting is a serious thing, this pales in comparison to other events and doesn't look to be premeditated at all.
Just judging from my personal experience at other Lone Star College campuses, the security staff they have on campus is very competent and almost always quite visible.