Here are some options depending on the situation:
General Terms:
* A mob: This implies a large, disorganized, and often violent group.
* A horde: This implies a vast, unorganized group, potentially driven by savagery or greed.
* A gang: This suggests a smaller, organized group, often focused on criminal activities.
* A rabble: This implies a disorderly and potentially dangerous group of people.
More Specific Terms:
* A riot: This refers to a violent public disturbance.
* A pogrom: This specifically refers to a violent attack on a particular ethnic or religious group.
* A wrecking crew: This suggests a group specifically organized to cause damage.
* A terrorist cell: This refers to a group organized to carry out acts of terror.
The best choice depends on the specific context and the nature of the destruction.