A riot is a form of civil disorder characterized by disorganized groups lashing out in a sudden and intense rash of violence, vandalism or other crime.

• 群体性事件（骚乱）是社会成员所处于的一种混乱状态，其特征主要表现为一群无组织的民众突然实施的暴力、破坏或其他违法行为。