Switzerland will hand over details of about 4,450 UBS bank accounts to U.S. authorities, settling a tax dispute that has threatened Swiss banking secrecy, the two governments said on Wednesday.

-- Switzerland says the agreement applies only to UBS and that the country's bank secrecy is upheld.

-- Swiss justice minister says if UBS had not reached agreement to hand over client data, it would have faced high fines that would have threatened its existence.

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-- Switzerland has agreed to review and process requests by the U.S. seeking information from Swiss banks besides UBS about account holders who may have tried to evade U.S. taxes, the U.S. government says.