Some officials say that controlling the villages was made even harder by the scrapping four years ago of police powers to detain any migrant found without the correct permits.

• 一些官员表示，警察曾经有权力扣留任何没有携带有效通行证的流动人员，但随着该权力在四年前得到废止，对村庄进行管制现在变得难上加难。