The Welsh family of British-Iranian mother Nazanin Zaghari-Ratcliffe are following negotiations with Tehran to free her closely. Prime Minister Boris Johnson said while on his visit to Saudia Arabia that talks to free her are "moving forward" and are "going right up to the wire".
The Prime Minister raised hopes on Wednesday that the dual national's six-year ordeal could come to a close after suggestions the mother of one has had her passport returned.
Read more: Why Boris Johnson's trip to Saudi Arabia is controversial
But Mr Johnson, during a trip to the Middle East, was cautious not to elaborate further on the state of negotiations with Tehran "because those negotiations continue to be under way".
A glimmer of optimism for the 43-year-old came a day earlier when her constituency MP, Tulip Siddiq, said she had been returned her British passport.
Her sister-in-law Rebecca Ratcliffe, who works as a GP in Newport, told BBC Breakfast: "It seems like positive steps are being taken and hopefully it is coming close to the end, but we just don't know how far these negotiations have gone.
"Since her capture and six years of torture, her mental health is quite unstable. She is very emotional, so when something like this happens they drive her into a state of high anxiety. There is a lot of high tension waiting to see what happens. It may be all over in a week or two, but it may be just a stunt. We have been here before and it hasn't happened. We just don't know what way it is going to go."
Mr Johnson confirmed a British negotiating team was working in Tehran to secure the release of dual nationals, while Mrs Zaghari-Ratcliffe remains at her family home in the Iranian capital.
"I really don't think I should say much more, I'm sorry, although things are moving forward," he told broadcasters at the Emirates Palace hotel in Abu Dhabi on Wednesday, March 15.
"I shouldn't really say much more right now just because those negotiations continue to be under way and we're going right up to the wire."
Mrs Zaghari-Ratcliffe was arrested in April 2016 as she prepared to fly back to the UK, having taken her daughter Gabriella - then not even two years old - to see relatives.
She was accused of plotting to overthrow the Iranian government and sentenced to five years in jail, spending four years in Tehran's Evin Prison and one under house arrest.
Both the British Government and Mrs Zaghari-Ratcliffe have always denied the allegations.
While the details of the negotiations remain unclear, it is possible they are linked to a £400 million debt dating back to the 1970s owned to Iran by the UK.
The Government accepts it should pay the "legitimate debt" for an order of 1,500 Chieftain tanks that was not fulfilled after the shah was deposed and replace by a revolutionary regime.
Tehran remains under strict sanctions, however, which have been linked to the failure to clear the debt.
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