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The latest police investigation is understood to concern allegations that contracts were forged in order to move and launder money.

Appearing in court in the city of Rishon LeZion, Steinmetz complained that he was the victim of a “political war” that he claimed was being financed by the investor and philanthropist George Soros.

A spokesman for BSGR had no comment to make.

The other suspects include David Granot, the chief executive of the Israeli telecoms corporation Bezeq, and Tal Silberstein, a former consultant to the former Israeli premier Ehud Barak and to the Austrian chancellor, Christian Kern.

On Monday, Israeli police issued a statement that said those detained were suspected of having “acted together and methodically with the prime suspect in order to create and present fictitious contracts and deals … on a foreign country in order to transfer funds and launder money”.