CBS affiliate KENS received a call from one woman whose husband works at the facility. She told the station that he was not being allowed to leave.
The blast comes as authorities search for answers to a series of explosions that have rattled Austin.
Police and federal agents said that the blast Sunday night triggered along a street by a nearly invisible tripwire suggests a “higher level of sophistication” than they have seen before in three early package bombs left on doorsteps, and means the carnage is now random, rather than targeted at someone in particular.
Two people are dead and four injured, and authorities don’t appear closer to making any arrests in the four bombings that have rocked the capital city.