The Guardian Council has agreed to a partial recount amid alleged irregularities, including an unusually swift announcement of results and a lack of variation in results between cities, rural areas, and ethnic strongholds.
Iran's supreme leader ordered the Guardian Council to investigate the candidate's claims of electoral fraud. But the council is headed by a cleric cut from the same cloth as President Ahmadinejad.
Street clashes between security forces and supporters of challenger Mousavi picked up after dark on Sunday after President Ahmadinejad addressed thousands of his supporters in Tehran.
His challenger, Mir Hossein Mousavi, is claiming irregularities. Police moved quickly to quell small protests.
Voters flocked to the polls to weigh in on the country's faltering economy and aggressive foreign policy.
Supporters of challenger Mir Hossein Mousavi clash with riot police and Hizbullah vigilantes.
Days before June 12 vote, Mir Hossein Mousavi gets 'savoir's' welcome in a former presidential stronghold
Obama criticized Holocaust deniers. But Ayatollah Khamenei praised US effort at a "new image."
More than 40 European diplomats walked out in protest over the Iranian leader's speech, in which he called Israelis "the racist perpetrators of genocide."
Egyptian police have arrested 25 suspects and are hunting for another 24 in the Sinai peninsula, where officials say the Iranian-sponsored group Hezbollah was operating a covert cell.
But despite their leader's message to Obama, Iranians at Tuesday's 30th anniversary rally continued to chant 'Death to America.'
As Obama spells out aims to engage with Iran, the Islamic Republic debates whether to step away from decades of hatred for the 'Great Satan.'
Despite President Obama's offer to extend a hand if Iran 'unclenched its fist,' Iranian officials say his choice of diplomats calls into question his commitment to change.
The Iranian leader's appearance at an interfaith iftar meal, expected Thursday, divides the faith community.
Washington warns of new sanctions after a UN report says Iran is expanding nuclear enrichment activities.
As UN nuclear watchdog meets in Vienna, sparring is sharp over Iran's goals for its program.
Iran's 'axis of resistance' may seem ascendant, but new chances for peace could redefine game in US's favor.
A critical IAEA report could spur a new round of sanctions. Iran maintains its enrichment program is peaceful.
President Mahmoud Ahmadinejad met with key Iraqi leaders and offered the country a $1 billion loan as he began a two-day visit Sunday.
The US is pushing stronger action, but others want only mild measures.