Gofynnwyd i Nick Hardwick, Prif Arolygydd Carchardai Ei Mawrhydi, gynnal ymchwiliad annibynnol, yn gyntaf i roi sicrwydd i’r Ysgrifennydd Gwladol erbyn diwedd y mis bod y trefniadau diogelu angenrheidiol ar waith, ac yn ail rhoi adroddiad llawn erbyn dechrau 2015 ar y ffeithiau a gwneud argymhellion pellach. Mae’r Weinyddiaeth Gyfiawnder wedi cadarnhau y bydd Aelodau Cynulliad yn cyfrannu at yr ymchwiliad hwn.
Nick Hardwick, HM Chief Inspector of Prisons has been asked to conduct an independent investigation, first to assure the Secretary of State, by the end of this month, that the necessary safeguards are now in place, and secondly, by early 2015, report in full on the facts and make further recommendations. The Ministry of Justice has confirmed this investigation will include Assembly Members.