At least 1,000 people have been arrested in the biggest anti-government protests for almost a decade, with the judiciary saying ringleaders could face the death penalty.
Iran's Supreme Leader Ayatollah Ali Khamenei has blamed the U.S. and the United Kingdom for the recent anti-government protests, adding that forces working against Tehran will never be successful.
"Revolution politically uprooted the enemy and now the enemy continues these attacks but always fails and can not achieve its goals", said Khamenei in a speech made before thousands in Tehran, according to the semi-official MEHR News agency.
"On the one hand, the USA government, in a hypocritical move and by chanting utterly false slogans, claims to be supporting the Iranian people, and on the other hand, taunts the civilized Iranian nation by imposing unfair sanctions, barring Iranian nationals from entering that country, and showing other malicious behaviors".
On Tuesday, the US House of Representatives overwhelmingly passed a resolution condemning what it called the Iranian leadership's crackdown on protests.
Following the unrest, people held several demonstrations across the country to condemn the violent riots and acts of vandalism, and voice support for the Islamic Republic's Establishment.
A judiciary official said on Tuesday that a detainee in Arak, a town about 200 km (124 miles) south of Tehran, committed suicide, according to Mizan, the website of the Iranian judiciary.
Initially, rallies began over the failing economy and falling standards of living but gradually spiralled into a larger anti-government campaign with people demanding an end to alleged corruption in state-run institutions.
Khamenei said U.S. President Donald Trump was grandstanding when he tweeted that protesters were trying "to take back their corrupt government", promising "great support from the United States at the appropriate time!"
This story was first published on CNN.com, "3,700 people were arrested during Iran protests, lawmaker says".