Assault?

I was on a paid holiday today. I went to Naha public employment bureau for references. When I was waiting at the inquiry counter, "Police!! Call Police!!" I heard a loud voice from an entrance. I looked over my shoulder toward the voice and saw a young man in his twenties overpowered by several staffs. I thought it was simulation training for an instant, the Police arrived actually. I don't know what was happened. Did he assault Job-centre? For what...?

I saw SASUMATA used indeed for the first time. SASUMATA is special baton to overpower an attacker safely.