Julian Assange is expected to make a public statement later on the diplomatic row that has engulfed him since being granted asylum by Ecuador.
Wikileaks says its founder is to speak outside the Ecuadorean embassy in London, where he has been since June.
He faces extradition to Sweden over sexual assault claims, which he denies.
Ecuador's president has suggested Mr Assange could co-operate with Sweden if assurances are given that there would be no extradition to a third country.
The 41-year-old Australian - whose Wikileaks website has published a mass of leaked diplomatic cables embarrassing countries including the US - first walked into the embassy in Knightsbridge, asking for protection, two months ago.
Mr Assange entered the embassy after the UK's Supreme Court dismissed his bid to reopen his appeal against extradition and gave him a two-week grace period before extradition proceedings could start.
It is established international protocol that local police and security forces are not permitted to enter an embassy, unless they have the express permission of the ambassador.
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