Don't you love it, a terror alert for Texas. Well, at least they were not too vague.
JohnSKa, if you really feel you may be in jeopardy during jury duty, you might consider checking with the folks there to see if they would allow you to carry an EVACU8 hood. The EVACU8 is basically a short term purified air system with a fire retardent hood that is supposed to be good to something like 1200 F. The air system is supposed to be good for something like 20 minutes. So while you may not be allowed to have weapons, hopefully they will allow you to have one of these units and so if the building is bombed or set ablaze and you survive, then hopefully the EVACU8 will provide the protection needed for you to get out of the building and not succombing to fumes, smoke, or flame.
I would also suggest arriving early and scoping out all the appropriate fire escape routes. It is a lot easier to learn where they are and where they go when you are not scrambling to save your life. There will be confusion enough without being lost.