The British-Iranian national being held in Iran, Nazanin Zaghari-Ratcliffe, has had her British passport returned, her MP in the UK Tulip Siddiq has said.
Ms Siddiq says she understands there is a British negotiating team in Tehran where she is being detained.
The MP for Hampstead and Kilburn tweeted: “I am very pleased to say that Nazanin Zaghari-Ratcliffe has been given her British passport back.
“She is still at her family home in Tehran. I also understand that there is a British negotiating team in Tehran right now.
“I will keep posting updates as I get them.”
A British-Iranian dual national, Ms Zaghari-Ratcliffe has been in custody in Iran since 2016 after being accused of being a spy.
She was taking her daughter to visit family when she was arrested at Tehran Airport and sentenced to five years in jail, spending four in Evin Prison and one under house arrest.
According to her family, she was told by local authorities that she was being detained because of the UK’s failure to pay an outstanding £400m debt to Iran.