The Ministry of Justice is to be fined £140,000 after the personal details of all the prisoners at Cardiff jail were mistakenly e-mailed to three inmates' families.
The Ministry says it treats the security of information very seriously and that it took immediate steps to recover the data as soon as the loss was reported.
More top news
All calm and quiet overnight, but southern areas could be in for a surprise tomorrow!
Scottish people living in Wales have been giving ITV News their opinions about the Scottish referendum vote on Friday.
While the campaign trail in Scotland has hotted up today, in Wales businesses are keeping a close eye on tomorrow's decision.