
From Threat Library, updated August 23
Arson forensics (also known as fire investigation) is the application of science to the investigation of arson. Arson forensics aims to determine the origin and cause of a fire and, if it is suspected to be arson, to gather evidence that could help identify the potential arsonists.
An adversary can usually easily determine whether a fire was accidental or arson. It is difficult to carry out an arson and make it appear accidental to an adversary who is knowledgeable in arson forensics.
Fire scene investigation
Fire scene investigation is the inspection of the scene of a fire, looking for:
- The ignition source that started the fire and the fuel that source ignited. For example, in an accidental residential fire the ignition source may be a malfunctioning electrical outlet that overheats and the fuel may be a sofa positioned against the outlet. In an arson the ignition source may be a match and the fuel may be gasoline brought by the arsonist.
- Patterns left by the fire on walls, floors, ceilings, and objects. These patterns can indicate where the fire started and how it spread. For example, a fire that starts at the base of a wall may leave a distinctive V-shaped burn pattern on the wall.
- Eyewitness accounts and video surveillance footage of the scene of the fire before, during, and after the fire.
When a fire occurring inside a room reaches a high enough temperature — typically between 500°C and 600°C — it reaches the flashover point. During flashover, the room is so hot that all ignitable surfaces ignite more or less simultaneously and the fire spreads rapidly throughout the room. Once a fire has reached flashover it is usually significantly harder for the adversary to interpret the patterns it left on walls and other surfaces.
Continue reading Threat Library: Arson Forensics






