Police have raided five properties as part of an international fraud investigation into a failed Icelandic bank.
Luxembourg police executed search warrants at three business premises and two residential locations at the behest of the UK's Serious Fraud Office (SFO).
The SFO is looking into the collapse of Kaupthing bank - one of three Icelandic banks that failed at the height of the credit crunch in October 2008.
Two of Britain's wealthiest property magnates, brothers Robert and Vincent Tchenguiz, were questioned earlier this month as part of the inquiry after officers swooped on their multi-million pound London headquarters.
The SFO announced an investigation into suspected fraud in December 2009 surrounding UK investment in what was advertised as a "high yield" deposit account called Kaupthing Edge.