Oil prices surged on Friday helped by a rise in Middle East worries, after Washington said it would provide military support to Syria's rebels and Iran went to the polls to elect a new president.
With results in from 10 percent of the polling stations, moderate candidate Hassan Rowhani has a clear lead, with 49.87 percent of the vote in Iran's presidential election.
Britain's BBC on Thursday accused the Iranian regime of perpetrating "unprecedented levels of intimidation" against families of its employees on the eve of the country's presidential vote.
Iran's presidential election is offering a flicker of hope to activists hoping to revive women's rights after they deteriorated during the eight years of Mahmoud Ahmadinejad's presidency.
Iran is working round the clock to enlarge its nuclear infrastructure with the eventual aim of developing an industry capable of building up to 30 bombs a year.
Mahmoud Ahmadinejad's "mismanagement" is largely responsible for Iran's severe economic crisis, most candidates for this week's presidential election have argued.
The US is making it easier for information-hungry Iranians to get on the Internet and use social media, but has also slapped new sanctions on the economy that could make their lives more painful.
Iran's defiant expansion of its nuclear programme and 10 failed meetings with the IAEA will dominate a gathering of the UN body's board starting Monday.
The United States on Thursday accused Iran of sponsoring "terrorism" at a level unseen in decades and said that the separate threat from Al-Qaeda has been significantly degraded.
An important recent development in Iran's nuclear programme, if it continues, might help to ease international fears that Tehran wants the bomb, but serious questions still remain.
French oil giant Total agreed Wednesday to pay US authorities $398.2 million to settle charges that it bribed officials in Iran to secure oil and gas concessions.
The United States on Tuesday condemned Iran's disqualification of hundreds of would-be presidential candidates, accusing the "unaccountable" clerical leadership of seeking to tighten its grip on power.
Nuclear talks between Iran and the UN atomic agency failed yet again Wednesday, as the top US diplomat in separate six-party negotiations warned Washington's patience was wearing thin.
Two sets of talks on Wednesday aimed at easing tensions over Iran's nuclear programme are not expected to produce any major breakthrough ahead of next month's elections in the Islamic republic.
The UN atomic agency will on Wednesday press Iran, in their 10th meeting since late 2011, to grant access to sites, documents and scientists involved in Tehran's alleged efforts to develop nuclear weapons.
A strong earthquake of 6.2 magnitude hit southern Iran early on Saturday, the US Geological Survey said, with local media reporting of damaged villages and several injuries.