Swedish prosecutor Ingrid Isgren has entered the Ecuadorean Embassy in London where WikiLeaks founder Julian Assange is to be questioned over a rape allegation.

Isgren was dropped at the embassy door at 9.30am on Monday and had to make her way up the steps through a throng of journalists.

The 45-year-old Australian has agreed to be interviewed on Monday by Isgren and an Ecuadorean prosecutor with a Swedish police investigator also present.

Assange has been holed up at the embassy since mid-2012 to avoid extradition to Sweden where he fears he could be further extradited to the US over WikiLeaks’ release of classified government documents.

Prosecutors plan to ask Assange to consent to providing a DNA sample.

Assange’s recently acquired cat was meanwhile watching proceedings from the window sill of one of the rooms on the embassy ground floor.

A few Assange supporters gathered across the street and hung banners on the railings saying “Free Assange” and “Thank You WikiLeaks”.

In February this year, the United Nations Working Group on Arbitrary Detention issued a decision condemning Sweden and the UK for the “arbitrary and unlawful deprivation of liberty” Assange had been subject to.

Tomorrow (Monday) Sweden will accept Julian Assange's statement after more than six years of refusing to do so https://t.co/2jOgvSu5bG pic.twitter.com/cdEpM8HLac

— WikiLeaks (@wikileaks) November 13, 2016