The raid on the Genesis Market trading venue took place on Tuesday. The operation, known as the "Cookie Monster", was led by the FBI, the police in the Netherlands and Europol.
The international crackdown led to nearly 120 arrests, more than 200 house searches and a large number of seizures. The site has now been closed.
Eight suspects
In Sweden, eight people are suspects. Seven of them were arrested and detained, while the eighth was already in custody in another case. The arrests took place in several places in Sweden, including Lund, Malmö and Stockholm. One of the suspects was still in custody as of Wednesday afternoon.
"They are suspected of hacking or aggravated hacking," Oskar Edvardsson, prosecutor at the National Unit against International and Organized Crime, told TT.
– A little simplified, they are suspected of having bought login information for other people for various websites, such as online stores. They have done this in order to be able to commit fraud or other types of data breaches.
The duration of the suspected crime varies for the different persons.
Swedish computers hacked
Genesis Market had access to a large number of stolen digital identities, containing, among other things, cookies and login information.
As far as Sweden is concerned, there was information from about 16,000 hacked computers containing over 850,000 login details, according to the police in Sweden.
"The marketplace has been an enabler for fraud and other types of cybercrime and in several cases may have been an unknown reason why people have been victims of crime," said Dan Håland, the police's national response leader for the operation, in a comment on the police's website.