Usage patterns
騒乱が起こるfor a riot/disturbance to break out
A riot broke out in the city late at night.
騒乱を鎮めるto quell a riot
The police were dispatched to quell the riot.
騒乱に巻き込まれるto get caught up in a riot
Tourists got caught up in the riot.
騒乱を引き起こすto trigger or cause a riot
That remark triggered a riot.