Incidents in which a large number of gang members rapidly congregate in a small area to commit crimes such as robberies are sometimes referred to as:

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Incidents in which a large number of people rapidly congregate in a small area to commit crimes such as robberies are commonly referred to as flash mobs. This term is often used to describe coordinated criminal activity, as well as non-criminal gatherings organized for entertainment or social purposes.

Incidents in Which a Large Number of Gang Members Rapidly