Traffic police officers demonstrate motorcycle skills during a police open week event in Nanjing, east China's Jiangsu Province, Jan. 6, 2024. A five-day open week event organized by the Nanjing Municipal Public Security Bureau was initiated Saturday at Nanjing International Expo Center. With various online and offline activities, the open week aims to bring the public closer to the life and work of police officers. China will mark its fourth national police day on Jan. 10 this year. (Xinhua/Li Bo)