Civil disorder may result from many situations, including a labor action (strike), political demonstrations and counter-demonstrations, or anniversaries of controversial incidents.
Intentional attacks using weaponized or non-weaponized chemical, biological, radiological, and nuclear materials can cause great harm and pose significant threats.
Some industrial or transportation accidents (including fires, explosions, and spills) have the capacity to release dangerous levels of hazardous substances, such as industrial chemicals, volatile fuels, toxic waste, compressed gas, or other poisons or explosives.