Police have arrested a number of suspected paedophiles in the largest ever operation in the UK against child pornography on the internet.
Officers have arrested 13 people and recovered 27 computers along with thousands of photographs, videos and magazines.
The Metropolitan Police Paedophile Unit co-ordinated the massive operation which involved 13 forces in England and Scotland.
Most of the material features scenes of children being raped and sexually abused.
The following forces were involved: Grampian, Derbyshire, Merseyside, Humberside, Hertfordshire, Thames Valley, West Yorkshire, Avon and Somerset, Bedfordshire, Lancashire, Devon and Cornwall, Sussex and Metropolitan.
DCI Bob McLachlan, head of the Met's Paedophile Unit, said: "Today's operation is the result of an intelligence led operation targeted at stemming the distribution of child pornography via the internet.
"Images like these are evidence of the sexual assault and rape of children - and anyone who buys or downloads them perpetuates the cycle of abuse."
"We know that the internet is increasingly used as a conduit for the exchange of pornographic pictures of children. Those responsible believe that the internet affords anonymity, but police technology in this area is increasingly sophisticated."