WikiLeaks founder Julian Assange is seen in a police van after was arrested by British police outside the Ecuadorian embassy in London, Britain April 11, 2019.

A Swedish prosecutor said on Tuesday she would not proceed with an investigation into an allegation of rape against WikiLeaks founder Julian Assange after a review of the evidence.

Deputy Chief Prosecutor Eva-Marie Persson said that the complainant's evidence was deemed credible and reliable, but that after nearly a decade, witnesses' memories had faded.

"After conducting a comprehensive assessment of what has emerged during the course of the preliminary investigation I then make the assessment that the evidence is not strong enough to form the basis for filing an indictment," Persson told a news conference.

The 48 year-old Australian citizen has repeatedly denied the allegation against him, made in 2010.