Is it the duty of the police to inform them?

Legal analysis: ordinary police will tell others their alarm number, and his number will be on the police work clothes!

Legal basis: People's Republic of China (PRC) People's Police Regulations Article 2 The tasks of the people's police are to punish counter-revolutionaries in accordance with the law, prevent and stop the sabotage activities of other criminals, maintain public security and social order, protect public property, protect citizens' rights and legitimate interests, safeguard the people's democratic system and ensure the smooth progress of the country's socialist construction.

Article 3 The people's police must rely on the masses, always keep close contact with them, listen to their opinions and accept their supervision. They must strictly abide by the Constitution and laws and strive to serve the people.

Article 4 The people's police are under the leadership of the people of China, the Ministry of Public Security and local public security organs at all levels. The establishment and management of the people's police shall be formulated separately by the State Council.