riot police; riot squad
Refers to a specialized police unit trained for crowd control, riot suppression, and disaster response. Often used in the full phrase 警察機動隊.
See also: 警察機動隊
The riot police were dispatched to the demonstration site.
I heard that riot squad training is very tough.
Riot police were dispatched as the crowd of protesters grew.
The police sent riot squads into the site.
The protesters clashed with the riot police.
The venue was surrounded by riot police.