Police investigate Colchester cancer treatment 'failures'
5 November 2013 Last updated at 22:26 GMT
A hospital trust in Essex is being investigated by police after staff said they were being "pressured or bullied" to falsify data relating to cancer patients.
The Care Quality Commission (CQC) says hospital data had been changed to make it appear that Colchester Hospital was hitting nationally-set targets for cancer treatment.
The BBC's Health Correspondent Branwen Jeffreys reports.