A British-Iranian woman jailed in Iran has been moved to a mental ward in hospital, her husband says.
Nazanin Zaghari-Ratcliffe, 40, was arrested in Tehran in 2016 while travelling with the couple's young daughter.
She was accused of spying, a charge she denies, and jailed for five years.
Mrs Zaghari-Ratcliffe was moved to the hospital ward in Tehran on Monday, where she is under the control of the Iranian Revolutionary Guard.
Her father says she has not been allowed to speak with her family and he has not been allowed to visit her.
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The Free Nazanin Campaign said this was unusual and, while her original referral was for at least a month, it is not known how long she will be in the psychiatric ward or the treatment she might get.
Mrs Zaghari-Ratcliffe last spoke with her family on Monday and said: "I was healthy and happy when I came to Iran to see my parents.
More from Nazanin Zaghari-ratcliffe
"Three and a bit years later and I am admitted to a mental health clinic.
"Look at me now, I ended up in an asylum. It should be an embarrassment.
"Prison is getting harder and harder for me. I hate being played in the middle of a political game. I just hate it."
Mrs Zaghari-Ratcliffe went on hunger strike for 15 days last month in protest at her "unfair imprisonment".
Her husband also went on hunger strike in solidarity, camping outside the Iranian embassy in London.
Mr Ratcliffe said: "Nazanin hoped that her hunger strike would move the Iranian authorities, and it clearly has.
"Hopefully her transfer to hospital means that she is getting treatment and care, despite my distrust of just what pressures can happen behind closed doors. It is unnerving when we don't know what is going on."
"I am glad her dad has been down there to keep vigil outside.
"Mental hospital has its worries at the best of times – but particularly when kept isolated and under the control of the Revolutionary Guard.
"Even now it still seems like games of power and control are being played by the Iranian authorities – even at the point of hospitalisation.
"We hope again this is the beginning of the end. And yet, we were also here last summer."
The couple's five-year-old daughter Gabriella has stayed in Iran with her grandparents since her mother's arrest.