Sony's PlayStation data warning after hacker attack
27 April 2011 Last updated at 09:44 BST
Sony has warned users of its PlayStation network that their personal information, including credit card details, could have been stolen.
The company said that the data could have fallen into the hands of an "unauthorised person" following a hacking attack on its online service.
Access to the network was suspended last Wednesday, but Sony has only now revealed details of what happened.
Technology correspondent Rory Cellan-Jones says the company has released a statement saying that experts took a further six days to realise how much data could have been taken.