Types of disasters usually fall into two broad categories: natural and man-made. Natural disasters are generally associated with weather and geological events, including extremes of temperature, floods, hurricanes, earthquakes, tsunamis, volcanic eruptions, landslides, and drought. Naturally occurring epidemics, such as the 2009 H1N1, 2014 Ebola, and 2019 novel coronavirus (COVID-19) outbreaks, are often included in this category. Man-made disasters are usually associated with a criminal attack such as an active shooter incident, or a terrorist attack using weapons such as explosive, biological, or chemical agents. However, man-made disasters can also refer to human-based technological incidents, such as a building or bridge collapse, or events related to the manufacture, transportation, storage, and use of hazardous materials, such as the 1986 Chernobyl radiation leak and the 1984 Bhopal toxic gas leak.