Nazanin Zaghari-Ratcliffe asks why it took six years for her to be released

Nazanin Zaghari-Ratcliffe has questioned why it took six years for her to be released in detention from Iran.

The UK-Iranian national said it was "unprecedented" to have seen five foreign secretaries come and go, in the time she was in prison.

This was her first media appearance since her return from Iran.

Nazanin holding first news conference since release