U.S. prosecutors charged three Swiss bankers on Tuesday of conspiring with wealthy U.S. taxpayers to hide more than $1.2 billion in assets from tax authorities.

The three bankers worked as client advisers at a Zurich bank branch and hid certain Swiss bank accounts and the income they generated, prosecutors said. They did not identify the bank branch.

The indictment filed in U.S. District Court in New York identified the three bankers as Michael Berlinka, Urs Frei and Roger Keller. It said they all live in Switzerland. Their attorneys were not immediately known.

If convicted, the bankers face a maximum prison term of five years under the conspiracy charge.

The case is USA v. Berlinka et al, U.S. District Court, Southern District of New York, no. 1:12-cr-00002-JSR.