LONDON (Reuters) - About 100 people in 12 countries were arrested on Wednesday in what police said was the biggest ever worldwide swoop on paedophiles operating on the Internet. British police coordinated the raids, codenamed "Operation Cathedral", in Europe, Australia and the United States. They recovered more than 100,000 indecent images of children as young as two from one U.S.-based paedophile club known as "Wonderland". "The content would absolutely turn the stomach of any right-minded person. It is disgusting stuff," said Detective Superintendent John Stewardson, who led the operation from Britain. Police said 11 people were arrested in Britain in dawn swoops across the country. In cooperation with other police forces and Interpol, 32 addresses were raided in the United States, 18 in Germany, 16 in Italy, eight in Norway, and one or two in Finland, Belgium, Austria, France, Sweden and Portugal. Police officials from the participating states had met over the summer at Interpol headquarters in France to prepare the action. British police said the majority of those arrested were men but some were women. Some of the children whose images were used in the paedophile club were related to those arrested. Charges have not yet been filed and will differ from country to country according to their different judicial systems. But charges could range from possession of pornographic material to the more serious offence of sexual abuse of children. Stewardson said police had worked with computer experts to recover a number of databases and had then tracked down the suspected members of the "Wonderland" club around the world. He said it was the biggest ever police assault on paedophile activity on the Internet. British police said they hoped to trace the young victims — girls and boys some of whom appeared to be only about two years old — and offer them support and counselling. The paedophile ring was originally targeted by police in Sussex, southern England, following a tip from the U.S. customs service. Interpol headquarters in France said British authorities had sought their assistance "when it became clear the arrests of the ring members, in almost constant contact over the Internet, would have to be very precisely co-ordinated". The Italian news agency ANSA said police swooped on addresses in six cities in Italy — Rome, Naples, Turin, Florence, Bologna and Catanzaro in the southern region of Calabria — and seized an unspecified amount of material.