LONDON: Forensic experts have failed to find crucial DNA evidence in the sexual assault case against Julian Assange, a British newspaper has reported.

In a 100-page document shown to lawyers for the WikiLeaks founder, Swedish police made a case for the 41-year-old's extradition to Stockholm for questioning.

Embassy asylum ... Julian Assange. Credit:AP

The report said staff at two forensic laboratories were unable to find conclusive evidence of Mr Assange's DNA on a torn condom provided by one of two women who claim to have been assaulted in August 2010.

However, the same analysts have found DNA believed to belong to Mr Assange on a condom from a second woman, The Mail on Sunday reports.