The U.S. government said Wednesday that Swiss banking giant UBS will provide the details of 4,450 U.S. client accounts suspected of tax evasion. The Internal Revenue Service (IRS) and the Department of Justice announced in a joint statement that they had a successful negotiation of an agreement that will 'result in the IRS receiving an unprecedented amount of information on United States holders of accounts at the Swiss bank UBS.' 'Under the agreement, the IRS will submit a treaty request to the Swiss government describing the accounts for which it is requesting information. The Swiss government will then direct UBS to initiate procedures to turn over information on thousands of accounts to the IRS.' According to the agreement, information on about 4,450 UBS accounts held by U.S. citizens will initially be provided to the U. S. authorities. The agreement retains the U.S. government's right, if the results are significantly lower than expected and other measures fail, to seek appropriate judicial remedies, including resuming actions to enforce 'the civil complaint,' the IRS and Justice Department said. The IRS will receive information on accounts of various amounts and types, including bank-only accounts, custody accounts in which securities or other investment assets were held and offshore company nominee accounts through which an individual indirectly held beneficial ownership in the accounts. The case stems from a settlement of a criminal complaint earlier this year in which UBS admitted to tax fraud by inviting rich U.S. clients to open accounts in Switzerland and thus avoiding declaring their income to the United States. The bank paid 780 million U.S. dollars to settle the criminal case. The two sides told a federal judge last week they had reached a tentative agreement, but the details were not released until Wednesday. 