Copenhagen Police have announced that they have been unable to find the person whose anonymous letter brought the Taxgate Commission investigation to a halt. 

Testimony by the final witnesses in the ongoing Taxgate hearings was delayed last week after the three-judge panel received an anonymous letter that accused high-ranking members of the political party Venstre of perjury. 

But police were forced to admit in a press release yesterday that they have been unable to determine who sent the letter. 

"We have not been able to establish the letter-sender's identity," police spokesperson Jens Møller Jensen, said. "An unknown fingerprint, which was not found in the police registry, was found on the envelope, but there is no certainty that the fingerprint belongs to the sender."

READ MORE: Taxgate tribunal narrows suspect list down to three

Commission hearings stalled

Police said it would now be up to the Taxgate Commission to determine "to what extent an anonymous letter should have on future hearings or other investigate steps". Previously, commission officials said that taken alone the letter would have no influence, but that if its claims could be proven, it would have a “decisive impact” on the hearing’s outcome. 

The Taxgate Commission has been holding hearings since August 2012 in an attempt to discover who was behind the illegal leak of the personal tax audit of PM Helle Thorning-Schmidt and her husband, Stephen Kinnock. The final three days of testimony were cancelled – one for illness and the other two due to the anonymous letter. The commission's website does not currently indicate when the final hearings will be rescheduled. 

The commission has identified the then-tax-minister, Troels Lund Poulsen (Venstre), his advisor Peter Arnfeldt and permanent Tax Ministry secretary Peter Loft as the three primary suspects in the leak.

Arnfeldt is already the subject of an official police investigation.