Several banks have been dragged into a money laundering scandal involving Denmark's Danske Bank, whose Estonian branch was used for 200 billion euros ($227 billion) of suspicious payments between 2007 and 2015, knocking their shares and fuelling investor fears.

The banks were also asked to give more information about their dealings with Mossack Fonseca, the law firm at the center of the so called Panama Papers scandal, Bloomberg reported.

"We have a close cooperation with authorities in all countries where we operate, however we don't go into details regarding our dialogue with the authorities," Nordea said in an e-mailed statement to Reuters on Friday.

SEB could not be immediately reached for comment.

(Reporting by Johan Ahlander; Editing by Alexander Smith)