With two weeks to go before they meet in court, the Swiss banking giant UBS is locked in negotiations with the US authorities over its offshore accounts.The case involves as many as 52 thousand US taxpayers suspected of holding 15 billion dollars in UBS accounts to avoid paying taxes at home. Media reports in Switzerland suggest UBS has offered to pay more than three billion euros to put an end to the US tax authority’s investigation into its operations. However, the US authorities have asked a federal court to order UBS to reveal the names of american offshore account holders, accusing the bank of “systematically and deliberately” flouting US laws. UBS admitted tax fraud in February and agreed to pay 780 million dollars as part of a provisional deal to settle charges. But US officials say this is not enough and have asked for the identities of all such account holders. UBS says this would violate client confidentiality.