Operation Ore followed the similar crackdown in the United States, called Operation Avalanche; in the US 100 people were charged from the 35,000 US access records available. In total 390,000 individuals in over 60 countries were found to have accessed material in the combined investigations.
Between 1999 and 2001, after a tip, a US investigation was conducted into Landslide Productions Inc., a Texas-based online pornography portal operated by Thomas and Janice Reedy. The portal was found to have provided access to child pornography and the Reedys were both convicted of trafficking child pornography in August 2001.
Following the investigation and conviction "Operation Avalanche" was launched, in the US, to trace and prosecute child pornography users identified in the Landslide database. In addition, the website was run for a short time as part of a sting operation by the FBI to capture new suspects. The FBI also passed identities from the Landslide database to the police organisations of other countries, including 7,272 names to the UK.
In May 2002, Operation Ore was implemented in the UK to investigate and prosecute the Landslide users whose names were provided by the FBI. In the UK, standard operating procedure dictates that all suspected child sex offenders are to be arrested quickly and thoroughly due to the potential high risk that they could pose to children. Those under investigation were reported by Rebecca Smithers of The Guardian to include government ministers, MPs and judges.
The charge of possession of child pornography was used where evidence was found, but the lesser charge of incitement was used in those cases where a user's details were on the Landslide database but no images were found on the suspect's computer or in their home. Because of the number of names on the FBI list, the scale of the investigation in the UK was overwhelming to the police, who appealed to the government for emergency funding for the case. Reportedly, several million pounds were spent in the investigations, and complaints mounted that other investigations were put at risk because of the diversion of the resources of child protection units into the case.