I was talking to a few co-workers and ex-classmates still at UT earlier. Outside of some of them being stuck in campus for hours on lockdown, it sounded like things were actually pretty smooth there today, all things considered. They had SWAT teams searching all the buildings and patrolling campus with APCs, and the warning sirens playing (those things were really annoying when they'd test em). One of my friends was helping run the call center used to take calls for the emergency, and that had calmed down by 3:00 or so, and everyone had pretty much left campus by then. Luckily, everyone I talked to indicated it wasn't too much of a big deal, and things should be back to normal relatively soon.
One thing I can tell you from going to school & working there, UT is *very* good about emergency situations, whether it's something like this or weather. They have tons of warning systems (mobile, text, email, sirens, etc)., and can lockdown campus in a matter of seconds. There was one time where there was a bomb threat at UT while I was there, and they had everyone locked down and alerted *extremely* fast. That situation ended without an explosion or anything, which is why it didn't get national headlines, but they were in control the second they found out about the threat.