The next attack could very well be a nuclear facility. A successful attack on a nuke plant would most likely kill millions and security at these plants have not really changed since 9/11. The Project On Government Oversight (POGO) interviewed 20 security guards at 13 different plants after 9-11 and found these plants were under-manned, under-equipped, and under-trained. One guard actually said "If an attack took place, most of the guards would run like hell."
http://www.pogo.org/p/environment/eo...nukepower.html
A statement from Congressman Edward J. Markey(D-MA) states:
"Rather than attempting to steal weapons-grade uranium and plutonium from a DOE lab, running the risk of being apprehended on their way out, a group of suicidal terrorists might attempt to kill the DOE security guard forces at a site, and, once inside, build and detonate a dirty bomb or homemade nuclear bomb in minutes. They don't need to ever come out of the building."
http://www.fas.org/news/usa/2002/nuc...key012302.html