According to RNZ, the Tongan police said they arrested 137 people mostly in the capital Nuku'alofa after Operation Safe Streets was launched on Friday.
The Police Commissioner Steve Caldwell said the operation was an effort to prevent crime and protect the public.
The police said the operation would run over the next several weeks and concentrate on Nuku'alofa, and throughout Tongatapu, where alcohol-fuelled crime is a problem.
Those arrested were to appear in the Magistrate Court tomorrow.
