Thanks, flutters. Do you have a url for this? a text document?
Yes, the information is on FEMAs website. Its listed in PDF documents. The specific info I posted is under the heading Technological & Man-Made Hazards and sub-heading National Security Emergencies Terrorism; Chemical and biological weapons; Nuclear and radiological attack; Homeland security advisory system near the bottom of the page.
Here is the link: FEMA