The European Union on Monday pushed Iran to guarantee the right to protest and separately British foreign minister Boris Johnson said "the United Kingdom is watching events in Iran closely".
US President Donald Trump, who has repeatedly criticised Tehran over four days of demonstrations, said it was "time for a change" and that Iran's people were "hungry" for freedom.
He tweeted yesterday: 'The great Iranian people have been repressed for many years.
The protests erupted last Thursday in Mashhad, Iran's second largest city, and quickly spread to cities nationwide. However, he said that Iran would counter "a small minority group" of rioters and outlaws seeking to exploit the protests and use them to harm Iran.
As many as 20 people have been officially reported killed including one policeman as demonstrations in Iran continued throughout Sunday. Armed protesters have tried to take over military bases and police stations before being repelled by security forces, according to Iranian state TV.
Meanwhile, Iranian President Hassan Rouhani said that the ongoing wave of protests may have been partially stirred up by external forces interested in destabilizing the Islamic Republic.
"This is nothing", Mr Rouhani said. Hundreds of demonstrators have been arrested. Iran has seen its largest anti-government protests since the disputed presidential election in 2009.
It was unclear if this was the same fatality as that reported by Iran's semi-official Mehr news agency on Monday. Iranians were hoping for improved living conditions following the nuclear deal and the lifting of some worldwide sanctions.
He also called on "all concerned to refrain from violence and for global obligations on human rights to be observed".
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"Those who damage public property, disrupt order and break the law must be responsible for their behaviour and pay the price", interior minister Abdolrahman Rahmani Fazli said on Sunday.
President Rouhani fired back at Trump: "This gentleman in America, who is now trying to sympathise with our nation, appears to have forgotten that he called the Iranian nation terrorists several months ago", he said.
State media began showing some footage of the demonstrations on Sunday, focusing on young men attacking banks and vehicles, an attack on a town hall in Tehran, and images of a man burning the Iranian flag.
The anti-government rallies were also countered by equally massive pro-government demonstrations.
While anti-government protests have broken out across the country, there have also been demonstrations of support for the government.
"It's clear there's a kind of discontent that's sweeping Iran over broad issues". Crowds of marching protesters were shown shouting slogans against mullahs and other religious figures in the country.
In a statement on Twitter, the ministry cautioned that Iran was seeing "large-scale disturbances and an unstable security situation" as well as "grave acts of violence".