Where the accord now stands, with Tehran taking another step away from the 2015 agreements to curb its nuclear development

President Rouhani says uranium gas to be injected into 1,044 centrifuges at underground nuclear site

State Department announcement comes as FBI already has a $5 million reward for information about Robert Levinson

Demonstrators gather in front of the former US mission in downtown Tehran as tensions remain high over the country's collapsing nuclear deal with world powers

Supreme leader cites Trump-Kim meetings to conclude Washington 'certainly and definitely won't make any concessions'

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

Revolutionary Guards chief attends ceremony to introduce the paintings, which include a Star of David in the Great Seal of the United States

Ahead of 40th anniversary of attack, Ebrahim Asgharzadeh denies seizure was directed by Revolutionary Guards, says plan was to hold a sit-in

Remarks by Brian Hook come amid growing concern in Israel over potential attack by Tehran in retaliation for efforts to thwart arming of Iranian proxies

Tehran complex is now partly a museum and a space for student groups, some of whom leave anti-American graffiti on its walls