Detention procedure: When the case-handling personnel of the public security organ think it necessary to detain the criminal suspect, they should fill in the Detention Report of Letters and Visits, indicate the relevant information and reasons, and issue a detention certificate after being reviewed by the department leader and approved by the person in charge of the public security organ. When a procuratorial organ detains a criminal suspect, the case-handling personnel shall put forward their opinions, which shall be submitted to the public security organ for execution after being examined by the department head and decided by the procurator-general; If it is too late to go through the detention formalities in an emergency, the people's procuratorate may first take the suspect to the public security organ and go through the detention formalities immediately. Due to the laws of our country, detention is carried out by public security organs. Therefore, if the people's procuratorate decides to detain a criminal suspect, it shall be executed by the public security organ, and the people's procuratorate may assist the public security organ when necessary.