What is an 'Arson set fire' and how may it be investigated?

• A. Categorised as malicious
• B. Categorised as deliberate
• C. Categorised as doubtful
• D. Categorised as malicious, deliberate or doubtful

Answer: (D)

An arson set fire is a fire started intentionally by someone, with a purpose other than normal use of the building or its contents. When investigators assess such fires, they don’t just label them as “arson”; they classify them based on the evidence into three categories: malicious, deliberate or doubtful.

If there’s clear evidence of intent to cause harm or property damage, with proof of motive or wrongdoing, the fire is described as malicious. If there’s unmistakable signs of planned ignition—for example, a deliberate act with consistent method and preparation, such as multiple ignition points or the use of accelerants—the fire is described as deliberate. If the evidence doesn’t allow a firm conclusion about whether the ignition was intentional, or if the cause remains uncertain after initial investigation, it’s categorized as doubtful.

In practice, investigators build this understanding by securing the scene, looking for ignition sources, and collecting physical evidence. They search for accelerants and residues, examine the fire patterns and the origin point, review CCTV or other digital evidence, and interview witnesses. Samples may go to a lab for accelerant detection, and the investigation documents the timeline, access points, and any motives or suspicious behavior. The final categorization guides the follow-up actions, including enforcement or further investigative steps.