Nazanin Zaghari-Ratcliffe talks ‘going to the wire’, says Boris Johnson

Hopes raised British-Iranian woman might finally be released after British passport returned to her

• Timeline: the detention of Nazanin Zaghari-Ratcliffe

Negotiations with Iran to free Nazanin Zaghari-Ratcliffe are going right up to the wire", Boris Johnson has said.

The UK prime minister said talks with Tehran over the release of the British-Iranian dual-national were moving forward" but that he could not say more as negotiations continue to be under way".