Witnesses describe security forces attacking protesters with axes and clubs in what some have called a "massacre."
Iran's reformist opposition leaders vowed to press on with legal challenges to an election they say was rigged...
Defeated candidate Mehdi Karoubi said the new Iran government was "illegitimate" and "should be annulled."
A group of over 200 Iranians gathered in Tehran to protest against the election result, despite government warnings.
"Neither the establishment nor the nation will yield to pressure at any cost," said Supreme Leader Khamenei.
Web-based technology, such as the social messaging service Twitter and online video-sharing site YouTube, have enabled Iranians to document and disseminate information to the world.
Iranians are reaching out to the world through whichever channels they can find. Using anti-censorship software, they are breaking through the blockades in record numbers. Using the phone, they are calling into Farsi-language radio stations in droves.
Ayatollah Ali Khamenei has agreed to extend the deadline for receiving and looking into election complaints.
Britain said it was throwing out two Iranian diplomats in response to Tehran's expulsion of two British diplomats.
President Barack Obama strongly condemned Iran's crackdown on anti-government protesters.