What is the collective noun for a set of people rioting and looting?

There are collective nouns for different types of lawbreakers (a band of robbers, a gang of hoodlums, a den of thieves, etc.), but no collective noun specifically for the Word lawbreakers. However, when there is no specific collective noun, any suitable noun can be used, such as a lair of lawbreakers, a disgrace of lawbreakers, an arrogance of lawbreakers...