Will the police inform the informant when they start the investigation?

After the police report a case and start an investigation, they generally don't inform the informant. If there is a complainant, the public security organ will inform the complainant whether or not to file a case.

After accepting a case, the public security organ shall, after examination, consider that the criminal facts that need to be investigated for criminal responsibility belong to its own jurisdiction, and shall file a case with the approval of the person in charge of the public security organ at or above the county level.

If it is considered that there are no criminal facts, or the criminal facts are obviously minor and need not be investigated for criminal responsibility, or there are other circumstances in which criminal responsibility is not investigated according to law, the case shall not be filed with the approval of the person in charge of the public security organ at or above the county level. If a complainant decides not to file a case, the public security organ shall make a notice of not filing a case and serve it on the complainant within three days.

Article 110 of the Criminal Procedure Law of People's Republic of China (PRC) * * * Any unit or individual who discovers criminal facts or suspects has the right and obligation to report to the public security organ, the people's procuratorate or the people's court. The victim has the right to report and accuse the criminal facts or criminal suspects who infringe on his personal and property rights to the public security organs, people's procuratorates or people's courts. Public security organs, people's procuratorates or people's courts shall accept reports, complaints and reports. If it does not belong to its own jurisdiction, it shall be transferred to the competent authority for handling, and the informant, complainant and informant shall be notified; For those who are not under their jurisdiction and must take emergency measures, they should take emergency measures first and then transfer them to the competent department. Where a criminal surrenders himself to a public security organ, a people's procuratorate or a people's court, the provisions of the third paragraph shall apply. Article 112 A people's court, a people's procuratorate or a public security organ shall, within the scope of their jurisdiction, promptly examine the materials of reporting, accusing, reporting and surrendering themselves, and if they think that there are criminal facts that need to be investigated for criminal responsibility, they shall file a case; If it is considered that there are no criminal facts, or the criminal facts are obviously minor, and it is not necessary to pursue criminal responsibility, the case shall not be filed, and the complainant shall be informed of the reasons for not filing the case. If the complainant refuses to accept it, he may apply for reconsideration.