High unemployment, high inflation and a deepening divide between poor and wealthy Iranians: The economic crisis in Iran is a major cause of frustration for many people. The easing of international sanctions following the 2015 nuclear deal has not improved people's living conditions as expected.

The majority of protesters so far are poor Iranians. People from major cities across the country converged on the capital, Tehran, to vent their anger when demonstrations began on December 28. They have since expanded to cities and towns in almost every province.

It is not clear who is spearheading the protests, or if anyone is leading them at all. The demands have, however, become more political: stop backing the Hezbollah militia in Lebanon, no intervention in Syria and Iraq. The protesters are urging the government to focus on domestic problems. There have also been calls for Ayatollah Khamenei to step down.

Five days after the demonstrators first took to the streets, Iran's supreme leader, Ayatollah Khamenei, reacted to the protesters' demands, accusing "enemies of Iran" of using "different tools including cash, weapons, politics and [the] intelligence apparatus to create troubles for the Islamic Republic."

Authorities report that 450 people were arrested in connection with the protests. Twenty-one people are believed to have died in violent clashes, among them 16 demonstrators. They are the largest protests Iran has seen since the disputed 2009 presidential election.