Authorities have launched an investigation into a potential food poisoning cluster that has affected 53 trainees understood to be from the Hong Kong Police College. The Department of Health said on Saturday that 48 male and five female trainees, aged 20 to 40, had developed symptoms of abdominal pain, diarrhoea, vomiting and fever since Thursday evening. It did not name the police college in its statement, only referring to the location as a training institute. A source confirmed to the South...