The Home Office has asked to see BBC undercover evidence of alleged racism and violence by security staff at an asylum seeker detention centre. The BBC heard evidence of detainees being physically and racially abused while officers made sure violence was not captured on CCTV. The BBC's Simon Boazman said most of the officers he met at Oakington did try their best to treat the detainees with dignity and respect. But there were a significant minority who were racist.