Panama papers

UPDATE 2-Norway calls corporate corruption summit after Panama Papers

Norway's government invited the heads of top company boards to talks on corruption as offshore banking revelations added to a string of allegations over the ethics of some of the country's largest firms.

The invitation follows the leak of more than 11.5 million documents from the files of a Panama-based law firm, allegedly showing how clients avoided tax or laundered money.

Among the leaked material on hundreds of thousands of clients in multiple jurisdictions were revelations that top Norwegian bank DNB helped customers set up offshore companies in the Seychelles.

DNB, in which the state owns 34 percent, said it regretted assisting about 40 customers in setting up the firms between 2006 and 2010, and that the practice had ended.