MIAMI — The U.S. government and Swiss banking giant UBS AG have reached an agreement in a case seeking names of some 52,000 suspected American tax evaders with billions in secret Swiss accounts, but details may remain under wraps until next week, officials said. Lawyers for the government and UBS told a federal judge in a brief conference call they had initialed a deal after a delay last week to settle undisclosed details. The Internal Revenue Service, which initiated the case against UBS earlier this year, said in a statement the deal "protects the United States government's interests." But the two-sentence statement from IRS Commissioner Doug Shulman added only that more details will be released when the Swiss government signs the agreement as early as next week. UBS and the Swiss government also welcomed the news and said no terms would be disclosed until it is signed.