What happened when I didn't leave Shijiazhuang but received a short message from Shijiazhuang Prevention and Control Office?

Under normal circumstances, this message is sent in groups.

The Office of Prevention and Control is a national unit under the Armed Forces. Its duties are to organize the implementation, supervision and inspection of the People's Republic of China (PRC) Civil Air Defense Law and other laws and regulations, to study and put forward the principles, policies, regulations and rules and regulations of civil air defense work, to draw up the protection categories and standards of key civil air defense cities nationwide and implement them after approval, and to organize the implementation of civil air defense organization and command work.

Establish and improve the civil air defense communication alarm system, accurately and quickly transmit air information, issue alarms, ensure command, build supporting civil air defense projects, and ensure the coverage of personnel and materials.