Iran's President Masoud Pezeshkian has blamed the US and Israel for the unrest.
"They have trained certain individuals inside the country and abroad, brought terrorists into the country from outside, set mosques on fire, and attacked markets and guilds in Rasht, setting the bazaar ablaze," he said without providing evidence.
As protests intensify, the number of deaths and injuries recorded by human rights monitors continues to rise.
Footage authenticated by BBC Persian and BBC Verify shows security officers shooting at gatherings of protesters in Tehran, in the western Kermanshah province and the southern Bushehr region.
Multiple verified videos filmed in the centre of the western city of Ilam last weekend show security forces firing shots towards Imam Khomeini Hospital, where a group of protesters had been holding a rally.
Staff at several hospitals have since told the BBC they have been overwhelmed with the injured and dead.
BBC Persian has verified that 70 bodies brought to one hospital in the city of Rasht on Friday night, while a health worker reported around 38 people dying at a Tehran hospital.
Sources inside Iran have told BBC Persian that plain-clothes officers have been targeting people filming and on their own at the protests.
Iran's police chief said on state TV that the level of confrontation with protesters had been stepped up, with arrests on Saturday night of what he called "key figures". He blamed a "significant proportion of fatalities" on "trained and directed individuals", not security forces, but did not give specific details.
More than 2,500 people have been arrested since protests began on 28 December, according to a human rights group.
The BBC and most other international news organisations are unable to report from inside Iran, and the Iranian government has imposed an internet shutdown since Thursday, making obtaining and verifying information difficult.
Never take any responsibility for what the leaders have done to their own country though