British-Iranian Nazanin Zaghari-Ratcliffe, who works for the Thomson Reuters Foundation as a project manager, was arrested at Tehran’s international airport by members of the country’s powerful Revolutionary Guard on 3 April. She and her young daughter, Gabriella, were about to return to the UK from a family visit in her home country. Zaghari-Ratcliffe has since been taken to an unknown location in Kerman, 600 miles south of the Iranian capital, but officials have not yet commented on the reasons behind her arrest. She has not yet been charged.

According to her family, she is not allowed access to a lawyer and is under pressure to confess to unspecified crimes. Gabriella has just spent her second birthday stranded in Iran, separated from her parents.