In a phone call with Iran's president Hassan Rouhani, the prime minister asked for the release of other detained British-Iranian nationals.
Jailed British-Iranian mother is enjoying her first taste of freedom in five years – though she has been summoned back to court.
The British-Iranian dual national was jailed five years ago in Tehran.
Richard Ratcliffe says Dominic Raab must "do something robust" if his jailed charity worker wife is not freed.
Her husband Richard Ratcliffe has called the British government's response "disastrous".
The British-Iranian woman has been imprisoned in Tehran since 2016.
Husband Richard Ratcliffe told HuffPost UK his wife was "hugely relieved".
For some, Brexit is a triumph. For others, it is a tragedy. HuffPost UK visited Brussels as British MEPs on both sides of the debate packed up and waved goodbye.
Boris Johnson met with the family of Nazanin Zaghari-Ratcliffe, who has spent almost four years in an Iranian prison. It is the first meeting with Richard Ratcliffe since Boris Johnson had to apologise over comments made to a select committee that contradicted what Nazanin Zaghari-Ratcliffe has said about her reasons for being in the country.
The husband of jailed British-Iranian mother Nazanin Zaghari-Ratcliffe described the news of the arrest as a "really bad sign".