The banks are Deutsche Bank (>> Deutsche Bank AG), Barclays (>> Barclays PLC), Royal Bank of Scotland (>> Royal Bank of Scotland Group plc), HSBC and Societe Generale (>> SOCIETE GENERALE), the court sources said.

The probe was opened in July after complaints from consumer groups.

It was not immediately possible to reach the banks for comment.

(Reporting by Vincenzo Damiani, writing by Jennifer Clark, editing by Francesca Landini)