Hong Kong police have arrested 20 people over a series of fraud cases in which a 19-year-old college student allegedly led a gang posing as mainland secret agents to swindle victims out of more than HK$2 million (US$257,000). Cheung Wai-shan, chief inspector of the force’s regional crime unit in Western district, said on Wednesday that the group – 16 men and four women aged between 11 and 84 – were arrested during a two-day operation earlier this week for various offences, including money...