(REUTERS) — Italian police said on Friday they had seized about $6 trillion of fake U.S. Treasury bonds in Switzerland, and issued arrest warrants for eight people accused of international fraud and other financial crimes.

The operation, co-ordinated by prosecutors from the southern Italian city of Potenza, was carried out by Italian and Swiss authorities after a year-long investigation, an Italian police source said.

The fake securities, more than a third of U.S. national debt, were seized in January from a Swiss trust company where they were held in three large trunks.

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