Nazanin Zaghari-Ratcliffe is being 'treated like a bargaining chip,' says British MP; UK-Iran citizen has spent over 4 years in jail or under house arrest

Nazanin Zaghari-Ratcliffe was first sentenced to prison by Iran's Revolutionary Court in Tehran on murky espionage charges in 2017

Husband of Nazanin Zaghari-Ratcliffe says there's 'a lot of relief' in the family after Iranian authorities delay her return date by 2 weeks

8 environmental activists sentenced, including one who reportedly also has British and American citizenship

In letters smuggled out of prison, Kylie Moore-Gilbert says she turned down chance to work for Revolutionary Guards and is held under extremely restrictive conditions

Arrested in April 2016 over espionage accusations by the regime, Nazanin Zaghari-Ratcliffe has undergone unspecified psychiatric treatment while incarcerated

Relatives speak of concerns that widespread economic discontent and recent rioting over fuel prices could impact their loved ones, demand that Tehran set them free

Mutual suspicion between Washington and Tehran has reached a level unseen since the Islamic Revolution, with people continuing to be used as bargaining chips

FM Zarif says he hopes to hear 'good news' soon, as Tehran angles for deal with Washington despite recent tensions

Foreign Secretary Jeremy Hunt asserts London not seeking escalation of tensions with Tehran, but wants assurances ship not heading for Syria