Authorities are investigating if money has been transferred from Switzerland to Hamas.
The probe pre-dates the Hamas attack on Israel, according to the Federal Attorney General, Stefan Blättler.
The investigation is made more difficult as Hamas has not been classed as a terrorist group by the government. If it had been, the process would be easier.
Bern says it is examining if Hamas should be. Switzerland does consider ISIS and Al-Qaeda terrorists.
Despite the lack of an official labelling of terrorist – the prosecutor does believe a conviction is possible.
But he also laments lack of staff at the Federal Police Office which is also hampering the investigation.
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