A website used by criminals to buy and sell credit card details and bank log-ins has been shut down after a police operation, the BBC has learned.
International forum Darkmarket ran for three years and led to fraud totalling millions of pounds.
Nearly 60 people connected with the site have been arrested in Manchester, Hull and London, as well as Germany, Turkey and the US.
The Serious Organised Crime Agency said it was "a one-stop shop" for criminals.
Soca deputy director Sharon Lemon told the BBC that one individual had spent £250,000 on personal data in just six weeks.
Had he realised the full potential of the information he had, he could have obtained up to £10m, she said.