As Indian tax authorities continue their investigation into Swiss bank accounts of several citizens, Switzerland today said India has sought assistance in the investigations into accounts allegedly held by former Congress minister Preneet Kaur and her son Raninder Singh.

As per the Swiss norms for assistance in tax matters, which could involve sharing of account and other details, the Federal Tax Administration (FTA) of Switzerland also asked Kaur and Singh to file an appeal within 10 days for "exercise of the right to be heard" after India's request for details on them.

On Monday, the Swiss tax department made these disclosures in two notifications published in an official gazette. However, the notifications did not disclose details about the two, except for their dates of birth and nationality.

Kaur had said that her statement was recorded by the tax authorities but she was not shown any document that may indicate that she had a foreign bank account or a trust.