The protests began as demonstrations against economic conditions in Mashhad but quickly turned against the government, with thousands marching in towns across Iran to chants of "Death to the dictator". Armed protesters have tried to take over military bases and police stations before being repelled by security forces, according to Iranian state TV.
A member of the Revolutionary Guards was killed in nearby Kahriz Sang and a passer-by in the town of Kahriz Sang - all in the region around the cultural centre of Isfahan.
It says all were shot by hunting rifles.
Protests remain focused on provincial towns and cities, with only small and sporadic protests reported in Tehran on Monday evening where a heavy police presence was reported.
Hundreds of people have been arrested following the clashes.
Other footage showed demonstrators burning police cars.
Another two people were killed in the town of Khomeinishahr, and the ninth fatality was a member of Iran's paramilitary Revolutionary Guard in the town of Najafabad.
That brings the estimated death toll to 21 in five days of unrest that represent the biggest challenge to the Islamic regime since mass demonstrations in 2009.
"The support for the rioters of Iran, by the highest official of U.S. along with some imperialist media shows that there is a new plot to stage a new intrigue in Iran", said Brigadier General Jazayeri, the Deputy Chief of Staff of the Iranian Armed Forces, on Monday.
Two protesters also were killed during clashes late Saturday in Doroud, authorities said.
Iran has seen its largest anti-government protests since the disputed presidential election in 2009.
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'I demand all prosecutors across the country to get involved and the approach should be strong, ' he said.
In separate comments in a gathering of lawmakers on Monday, President Hassan Rouhani lashed out at his United States counterpart for commenting on the recent protests in Iran, saying the man who already called the Iranian people terrorists has no right to sympathize with the nation. They are hungry for food & for freedom.
The EU has also pushed Iran to guarantee the right to protest.
A recent increase in egg and poultry prices by as much as 40%, which the government has blamed on a cull over avian flu fears, appears to have been the spark for the economic protests.
He made the remarks touching upon the latest reactions, remarks, and tweets by some westerner officials like US President Trump.
Can protesters drive them out?
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".
Previously, Germany called on both Iranian authorities and the protesters to restrain from violence.
Iran's economy has improved since the nuclear deal, which saw Iran agree to limit its enrichment of uranium in exchange for the end of some global sanctions.
That improvement has not reached the average Iranian, however.
Tehran now sells its oil on the global market and has signed deals to purchase tens of billions of dollars' worth of Western aircraft. Unemployment remains high, and official inflation has crept up to 10% again.