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GlossaryCrime classifications

Arson

Arson is a defined fire-setting offense. Learn why a fire report, suspected cause, and undetermined cause do not by themselves establish that offense.

Arson is a fire-setting offense involving unlawful and intentional damage, or an attempt to damage property, by fire or an incendiary device under the applicable definition. A fire response does not by itself establish arson. The cause investigation, statistical classification, and legal charging decision are different stages and can use different terminology.

Intent and cause need evidence

The FBI's NIBRS manual defines an arson category and provides reporting rules for completed and attempted offenses. A fire's suspicious circumstances alone should not be rewritten as a confirmed offense without supporting findings. FBI arson definition

A fire-service incident record can document attendance, damage, and a cause assessment. A police offense record classifies alleged criminal conduct. An investigator's conclusion and a court's verdict answer different questions. A reader needs to know which source supports the word arson.

The category can involve different kinds of property, not only occupied buildings. NCSBI's statistical definition covers real and personal property. The legal elements of a charge remain specific to the jurisdiction. NCSBI offense definitions

Example

Hypothetical example: A fire damages an outdoor storage shed. Crews document the response. A later investigation establishes unlawful intentional fire-setting under the agency's reporting criteria, and an arson offense is entered. The available records identify no arrested person.

The fire response and later offense entry describe different stages of one event. The absence of an arrest does not erase the offense classification. Conversely, the initial fire call would not have supplied enough information to establish arson before that investigation. The example gives no operational details about setting a fire.

Common confusion

An undetermined cause means the cause has not been established under the source's framework; it is not automatically arson. A false alarm concerns an alarm classification and does not describe a confirmed intentional fire.

Vandalism is another property-damage category. The cited reporting definitions distinguish arson from general damage, so the categories should not be combined without the applicable rules. “Intentional fire” in a fire dataset also needs its own definition before being equated with a criminal charge.

Comparing records

State the source, definition/version, period, and whether the total counts fires, offenses, structures, or victims. One fire can damage several properties or involve several responding agencies. Later findings may revise the classification. Do not assume every fire-service record has a matching police arson report, or use either count as a conviction total without a separately documented linkage.

Sources