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Incident

An incident is an event recorded by an agency. Its meaning and counting rules depend on whether the source is dispatch, a report, or crime statistics.

An incident is an event recorded by a public-safety agency. Its exact meaning depends on the source: a dispatch incident can describe a request for assistance, while a crime-reporting incident follows a specific reporting definition. One incident may involve several calls, responders, people, or offenses.

Identify the system before counting

In everyday public-safety records, “incident” is a broad organizing word. A traffic hazard, a medical request, and a reported theft can each be incidents in their respective systems. The label does not establish that all events are crimes or that different agencies count them identically.

San Francisco's dispatch documentation treats a row as a dispatch incident and explains how multiple incoming calls may be associated with that event. It also describes cases in which separate dispatch records remain linked as duplicates. San Francisco's counting explanation.

The National Incident-Based Reporting System, or NIBRS, uses a narrower definition for crime reporting. The FBI's 2025.0 manual groups offenses into an incident based on the offenders acting together and the relationship in time and place. Those are reporting rules, not a definition to apply indiscriminately to every local activity log. FBI manual, section 2.1.

Example

Hypothetical example: Two people call about the same collision at an intersection. Dispatch creates one event and assigns a police unit and an ambulance. The police department prepares a collision report; the ambulance crew completes its own patient-care documentation.

There is one underlying collision, but several records describing different parts of the response. Counting all documents as separate incidents would overstate the number of collisions. Counting only the police report would omit the medical service activity if the question concerned ambulance workload.

In a separate hypothetical crime-reporting example, one offender damages a locked storage room and steals equipment during the same continuous event. Depending on the applicable reporting rules, the agency may record multiple offense categories within one incident. The number of offenses and the number of incidents can therefore differ even within one agency's file.

Common confusion

Incident versus call: Several incoming calls can describe one incident. A dispatch incident can also begin with an officer's observation rather than a public call.

Incident versus offense: An offense is a classified criminal act. An incident is the event grouping used by the source. Dispatch incidents can be noncriminal, while a crime-reporting incident can contain more than one offense.

Incident versus report: A report is a record about an event. Supplements and records from different agencies can describe the same underlying event without being duplicate documents.

What an incident number establishes

An incident number identifies a record within the issuing system. It does not necessarily identify the same real-world event across police, fire, medical, or court systems. Different agencies may assign different numbers, and a dispatch number may differ from a later case number.

For a dataset, locate the stated unique identifier and check whether repeated identifiers represent offenses, units, victims, or revisions. Counting distinct identifiers can help only after the field's meaning is known. Removing every repeated number could discard legitimate detail; counting every row could multiply events.

A well-described incident total states the agency, system, period, date basis, and counting rule. That context lets a reader distinguish “events dispatched during October” from “crime incidents reported during October,” even when both displays use the shorter heading “incidents.”

Sources