Visitors examine an exhibitor’s surveillance system at the 16th China Public Security Expo, which opened at the Shenzhen Convention and Exhibition Center on Sunday, attracting more than 1,100 exhibitors from 53 countries and regions. The expo showcases the applications of big data, cloud technologies, Internet of Things and AI (artificial intelligence) in the sectors of public security and intelligent surveillance, smart city, smart home and transportation, anti-theft and anti-terrorism, navigation, biological recognition, firefighting and criminal investigation. The expo, said to be the world’s largest in the public security sector, covers 110,000 square meters. Sun Yuchen