A source inside Iran who was able to call out told CBS News on Tuesday that activist groups working to compile a full death toll from the protests, based on reports from medical officials across the country, believed the toll was at least 12,000, and possibly as high as 20,000.

Demonstrations that began as outrage over the economy have spread across the country, amid an escalating crackdown by the authorities and the threat of U.S. military action.

Iranians could make phone calls abroad after a communications blackout during a crackdown on anti-regime protests, but internet and text messaging remain restricted.

The demands of Iran’s ethnic minorities differ from many of those in Tehran, and they have reason to fear the return of the Pahlavi monarchy.

Nationwide protests in Iran are putting new pressure on its theocracy as the country faces an economic crisis.

New clashes over ICE operations in Minneapolis; Backlash after DOJ launches criminal investigation into fed chair; Trump responds to anti-government protests in Iran getting more violent; and more on tonight’s broadcast.

Iran's government imposes five-day internet blackout as nationwide protests intensify, with at least 646 people killed and over 10,000 arrested during the crackdown.

Human rights groups estimate that hundreds of Iranian protesters have been killed by government security forces since late last year, in what may be the largest - and possibly most consequential - wave of protests in Iran since 2009.