Which scenario is an example of an active attacker situation?

An active attacker situation is characterized by an individual who is actively engaged in a violent act that poses an immediate threat to the safety of others. In this scenario, the individual actively shooting in a crowded area exemplifies this definition. This behavior indicates an ongoing, dangerous situation where lives are in immediate jeopardy, and law enforcement or emergency responders must react swiftly to prevent further harm.

The other scenarios present different circumstances that, while potentially dangerous, do not exemplify an active attacker situation. For instance, a police chase involves law enforcement attempting to apprehend a suspect but does not necessarily involve an ongoing violent act directed at civilians. An individual attempting to rob a bank might imply a threat, but if they are not actively harming anyone, it doesn't meet the criteria of an active attacker. Similarly, a threat received via social media is a concerning situation, but it is not a real-time, physical act of violence occurring in a public space like the scenario of active shooting is.