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Pirate Bay co-founder Gottfrid Svartholm Warg is suspected of being involved in one of Denmark's biggest hack attacks.

Danish police accused him of helping an unnamed Danish hacker gain illegal access to a number of databases holding sensitive information.

The attacks yielded driving licence records, official email messages and millions of social security numbers.

The accusation comes as Mr Warg is on trial for a hack attack in Sweden.

Danish newspapers report that police suspect Mr Warg was involved in a series of hack attacks between April and August last year on databases run by the CSC services company.

The police investigation into the attacks has led to the arrest of a 20-year-old Danish man alleged to be Mr Warg's accomplice. This man has pleaded not guilty to hacking charges but is being held in jail while the investigation continues.

Charges against Mr Warg for the attacks has been prepared by Danish police, who are seeking his extradition.

So far, there was no evidence that the data downloaded from the databases was abused or sold on, Danish police said. However, the theft of the social security numbers could cause problems because they are determined by birthdates and so are hard to change.

The accusation comes at the conclusion of a trial in Mr Warg's native Sweden over a separate hack attack. In that incident, Mr Warg is accused of hacking into the IT systems of the Logica services company and stealing ID details of 9,000 Swedes. In another hack attack, he is also accused of trying to steal cash.

A decision in the Swedish case could come as soon as 14 June, Mr Warg's lawyer told the Ars Technica tech news site. If found guilty, Mr Warg could face up to two years' jail.