Warning: Report contains mention of rape and sexual assault. An "incredibly dangerous" sex offender who drugged his victims and installed spy cameras around his home has been jailed for life with a minimum term of 14 years – as police appeal for hundreds more potential victims to come forward. Chinese national Chao Xu, 33, has been described by police as "one of the most prolific offenders ever uncovered" by the Metropolitan Police. Read more: https://news.sky.com/story/sex-offender-chao-xu-