State TV said six rioters were killed during an attack on a police station in the town of Qahdarijan while Iran's Supreme Leader accused enemies of the Islamic Republic of stirring unrest Iranian.
Iran's Supreme Leader on Tuesday accused enemies of the Islamic Republic of stirring unrest, as anti-government demonstrations that began last week continued.
"In recent days, enemies of Iran used different tools including cash, weapons, politics and intelligence apparatus to create troubles for the Islamic Republic," Ayatollah Ali Khamenei was quoted as saying in a post on his official website.
Khamenei said he would address the nation about the recent events "when the time is right."
Clashes overnight between protesters and security forces in Iran killed nine people, state television reported on Tuesday, including some rioters who tried to storm a police station to steal weapons.
The demonstrations, the largest to strike Iran since its disputed 2009 presidential election, have seen six days of unrest across the country and a death toll of at least 20.
The protests began on Thursday in Mashhad over Iran's weak economy and a jump in food prices and have expanded to several cities, with some protesters chanting against the government and the supreme leader, Ayatollah Ali Khamenei.
Some 450 people have been arrested in the Iranian capital over the past three days during unrest linked to protests, an official told local media on Tuesday.
“200 people were arrested on Saturday, 150 on Sunday and around 100 on Monday,” Ali Asghar Naserbakht, a deputy in the Tehran city governor's office, told the ILNA news agency.
State TV reported that six rioters were killed during an attack on a police station in the town of Qahdarijan. It reported that clashes were sparked by rioters who tried to steal guns from the police station.
State TV also said an 11-year-old boy and a 20-year-old man were killed in the town of Khomeinishahr, while a member of Iran's paramilitary Revolutionary Guard was killed in the town of Najafabad. It says all three were shot by hunting rifles, which are common in the Iranian countryside.
The towns are all in Iran's central Isfahan province, some 350 kilometres (215 miles) south of Tehran.
It wasn't clear if the Revolutionary Guard member was the same fatality report late Monday night by Iran's semi-official Mehr news agency. Mehr had said an assailant using a hunting rifle killed a policeman and wounded three others in Najafabad.
Monday marked the first night to see a fatality among Iran's security forces.
President Hassan Rouhani has acknowledged the public's anger over the country's flagging economy, though he and others warned that the government wouldn't hesitate to crack down on those it considers lawbreakers.
That was echoed Monday by judiciary chief Ayatollah Sadegh Larijani, who urged authorities to confront rioters, state TV reported.
"I demand all prosecutors across the country to get involved and the approach should be strong," he said.
Neighbouring Turkey, meanwhile, on Tuesday expressed "concern" over the unrest in Iran.
"Turkey is concerned by news the protests in Iran ... are spreading, causing casualties and also the fact that some public buildings were damaged," the Turkish foreign ministry said in a statement, adding "common sense should prevail to prevent any escalation."
