Some of the documents provided also included emails between client advisors and their US clients, personnel records and customer profiles, Swiss online news platform Blick.ch reported on Tuesday.
The number of documents already delivered is estimated to be between four and six and a half million, all of which have been provided by bank giant Credit Suisse. The move is seen as part of Switzerland’s strategy to try to stem the tide of US attacks on Swiss banks.
The documents are encrypted to protect the names of individuals, Blick said. The key to decoding the information will only be provided on assurances from the US that no further action against Switzerland’s remaining 300 banks will be taken, Blick reports.
Switzerland wants these assurances to be enshrined in a new treaty with Washington, radio station DRS reports.