Regulations Governing the Forcible Deportation of the People of the Mainland Area and the Residents of Hong Kong and Macau Article 10

Police departments or other related agencies may be called upon for the assistance needed in executing the forcible deportation of the people of the Mainland Area or the residents of Hong Kong and Macau.
中文原文 大陸地區人民及香港澳門居民強制出境處理辦法第10條
執行大陸地區人民、香港或澳門居民強制出境時,得請求警察機關或其他有關機關(單位)提供協助處理。

English translation for reference only; the Chinese text prevails. Not legal advice.