An incident which disrupts a community and requires intervention to maintain public safety is a civil disturbance. Examples are demonstrations, riots, strikes, public nuisances, and criminal activities.
Hazard Identification and Vulnerability Assessment
In the United States, protesters and anarchists tend to practice civil disturbance at large, scheduled peaceful gatherings such as marches or world and global meetings. Their activities can involve disruption of events, resistance, and rejection of control and authority. Modern groups are well-organized, using command centers, tactical communications, and the internet for planning and operations. Control of the incident requires police forces trained and experienced in the Incident Command System and riot control. Effects of civil disturbance can include injury to participants and spectators and property damage.
The last decade has seen increased rioting and looting in the United States following sporting events. Generally, populations of more than 100,000 are vulnerable to civil disturbances.