Julian Assange will not hand himself in despite a promise to do so if Chelsea Manning was granted clemency, according to one of his lawyers.

WikiLeaks had pledged in a tweet that its founder would agree to be extradited to the US if Barack Obama granted clemency to Ms Manning, which he did in the final hours of his presidency. Mr Assange's lawyers initially seemed to suggest that promise would be carried through – telling reporters that he stood by his earlier comments – but it appears now that Mr Assange will stay inside the embassy.

The commitment to accept extradition to the US was based on Ms Manning being released immediately, Mr Assange's lawyer told The Hill. Ms Manning won't actually be released until May – to allow for a standard 120-day transition period, which gives people time to prepare and find somewhere to live, an official told The New York Times for its original report about Ms Manning's clemency.

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“Mr. Assange welcomes the announcement that Ms. Manning's sentence will be reduced and she will be released in May, but this is well short of what he sought,” Barry Pollack, Assange’s US-based attorney, told the site. “Mr. Assange had called for Chelsea Manning to receive clemency and be released immediately.”

The statement brings an end to a series of questions about whether or not Mr Assange would be leaving after Mr Obama's surprise announcement. News outlets including The Independent had taken Wikileaks' decision to re-state his commitment to honouring the pledge as an indication that he would accept extradition.

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Julian Assange has been inside the Ecuadorian Embassy in London since summer 2012, refusing to meet prosecutors in Sweden, where he is wanted on a rape allegation. He has said that he fears that if he leaves he will be extradited to the US on espionage charges.

It isn't actually clear whether or not Mr Assange faces extradition to the US. Authorities and Wikileaks lawyers have refused to state whether such an extradition has requested, but it may have been done privately or not at all.