Chinese police use new anti-fraud app installed on more than 200 million cellphones to identify and question people [who have visited financial news sites abroad](//www.ft.com/content/84b6b889-ae03-47f7-9cd0-bd604b21d5de) , according to people summoned by the authorities. According to a report: The app was launched in March by the National Anti-Fraud Center of the Ministry of Public Security and blocks suspicious phone calls and reports malware. Police said this was necessary to combat an upsurge in fraud, often perpetrated by overseas operations run by Chinese and Taiwanese nationals. The ministry recommended that the app be downloaded, but many local government agencies have made it…