Iranian security forces have killed at least 378 people, including 47 children, in a crackdown on protests sparked by Mahsa Amini's death, a rights group said in an updated toll.

The Islamic republic has been gripped by protests that erupted over Ms Amini's death on 16 September, three days after her arrest for an alleged breach of the country's strict dress code for women.

The protests were fanned by fury over the dress rules for women, but have grown into a broad movement against the theocracy that has ruled Iran since the 1979 revolution.

"At least 378 protesters, including 47 children, have been killed by the oppressive forces since September 16," said Iran Human Rights director Mahmood Amiry-Moghaddam.

The figure represents an increase of 36 since the Norway-based group issued its previous toll on Wednesday.

It includes at least 123 people killed in the province of Sistan-Baluchistan, on Iran's southeastern border with Pakistan, 40 in both Kurdistan and Tehran provinces and 39 in West Azerbaijan province.

Iran Human Rights warned that the regime had been mounting a "campaign of spreading lies" ahead of a meeting of the UN Human Rights Council next week.

"They have two goals by attributing the killing of the protesters to terrorist groups like Daesh," Mr Amiry-Moghaddam said, referring to the Islamic State group.

"They want to use it as an excuse for more widespread use of live ammunition," he said.

"And they also want to influence countries in the UN Human Rights Council who will gather on November 25 in a special session considering establishing an independent investigation and accountability mechanism" over the crackdown in Iran, he added.

Meanwhile, Iran's foreign ministry criticised the international community's "silence" towards acts of violence in the country.

It has accused its foreign foes, including Britain, Israel and the United States, of fomenting the unrest.

The ministry hit out at the "deliberate silence of foreign promoters of chaos and violence in Iran in the face of... terrorist operations in several Iranian cities".

"It is the duty of the international community and international assemblies to condemn the recent terrorist acts in Iran and not to provide a safe haven for extremists," it said in a statement.