Threat Assessment
Some various threats to civilians and civilian life are nuclear, biological, chemical, information warfare (cyberattacks), etc. Each needs to be looked at and studied so that preventative measures can be built into civilian life. Information warfare is a new kind of warfare where information and attacks on information and its system are used as a tool of warfare. ...
Conventional
This would be conventional explosives. Blast sheltering against nuclear blast would pretty much protect against conventional explosives, but not vice versa.
Nuclear
The biggest threats from a nuclear attack are effects from blast, fires and radiation. There is also the possibility of terrorists employing a radioactive "dirty bomb". The term dirty bomb is most often used to refer to a Radiological Dispersal Device (RDD), a radiological weapon which combines radioactive material with conventional explosives. ...
Biological
The threat here is primarily from disease-causing microorganisms such as bacteria and viruses.
Chemical
Various chemical agents are a threat such as nerve gas (VX, Sarin, mustard gas, etc.). Nerve agents (also known as nerve gases, though these chemicals are liquid at room temperature) are a class of phosphorus-containing organic chemicals (organophosphates) that inhibit the acetylcholinesterase enzyme in animals. ...
Information Warfare
Attacks to a country's information infrastructure are a threat and, since so many facets of modern life are tied into computers and information systems, such attacks could have financial and economic consequences.