White House makes holiday appeal for release of retired agent, two others.
Seventh straight week of gains and nuclear deal between world powers and Iran boosted sentiment in world stocks.
Lawmakers are making contingency plans for what happens if — or when — nuclear accord with Iran falters.
Favorable nuclear deal frustrates Israel, boosts Tehran's regional clout.
Envoys back at negotiating table trying to chip away at differences.
Ayatollah Ali Khamenei insisted there are limits to concessions Iran will make.
Talks between world powers and Iran are set to resume Wednesday after failing to strike an accord last weekend.
Negotiations aimed at ending stand-off over its nuclear ambitions are "tough", Tehran's foreign minister said on Thursday.
Nobel Peace Prize laureate slams the new president, alleges an uptick in executions since he took office this year.
Pegah Agangarani sentenced to 18 monrhs in prison on 'security charges.'
