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(Bloomberg) -- Three Swiss bankers accused in 2012 of helping Americans hide more than $1.2 billion from the U.S. Internal Revenue Service face new charges of obstructing the agency from collecting taxes on undeclared accounts.

Federal prosecutors in Manhattan filed an expanded indictment Wednesday against former Wegelin & Co. bankers Roger Keller, Urs Frei and Michael Berlinka. Keller, 50, was arrested on Feb. 2 in Frankfurt, where he faces extradition to New York.

To contact the reporter on this story: David Voreacos in federal court in Newark, New Jersey, at dvoreacos@bloomberg.net

To contact the editor responsible for this story: Andrew Dunn at adunn8@bloomberg.net

Bloomberg