Iran has released Kian Tajbakhsh, an Iranian-American arrested on charges of harming national security earlier this year.

Iran is testing Western intentions by working with the UN atomic watchdog to resolve a nuclear row but the opportunity for such cooperation may not be repeated, a senior Iranian official said on Thursday.

French oil group Total is still in discussions with Iranian partners on its liquefied natural gas (LNG) terminal project for gas extracted from the South Pars field, but added political issues could cause problems for the company.