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Seven people were killed during protests in of Iran overnight, a rights group said, as authorities pursued a on nationwide demonstrations sparked by in the custody of morality police.

Nearly four weeks after Amini, a 22-year-old Iranian Kurd, was detained in Tehran for "inappropriate attire", the protests show no sign of abating in a bold challenge to Iran's clerical rulers, even if the unrest does not seem close to toppling them.

The protests have underlined pent-up frustrations over freedoms and rights in Iran, with many women joining in. The deaths of several teenaged girls reportedly killed while demonstrating have becoming a rally cry for more protests.

While many officials have struck an uncompromising tone, a top advisor to Supreme Leader Ayatollah Ali Khamenei has been cited as questioning whether police should be enforcing headscarf-wearing - rare criticism of state efforts to impose the hijab.

Human rights groups have reported more than 200 killed in the crackdown on the protests, which have been particularly intense in Kurdish regions where security forces have put down unrest by the Kurdish minority in the past.

"Kurdish provinces are among the most deprived in Iran, have some of the highest unemployment rates, and have limited access to basic services," writes

— °®Âþµº (@The_NewArab)

A source in Sanandaj, the provincial capital of Iranian Kurdistan, told Reuters that riot police were searching houses and arresting dozens of young people, describing the situation as very tense with hundreds of police officers on the city's streets.

"We have information from Baneh and Saqez as well. They have arrested dozens of young people since yesterday, including teenagers," added the source, who declined to be identified because of fears for their safety.

Rights group Hengaw, which reports on Iran's Kurdish regions, said protesters in 10 cities had confronted "security forces' intense violence" on Wednesday night.

In the city of Kermanshah, direct fire from security forces killed two people, Hengaw said. It posted a picture of the body of an 18-year-old man it said was one of the dead.

A video posted on social media from Kermanshah late on Wednesday showed a fire burning in the road. "Kermanshah is hell, it's war, it's war," a voice can be heard saying.

Kermanshah tonight. So many towns & cities resembled Kermanshah today.

— Alireza Nader علیرضا نادر (@AlirezaNader)

Kermanshah, tonight, 12 October

— Borzou Daragahi 🖊🗒 (@borzou)

Three members of the security forces were also killed in Kermanshah and around 40 more injured, Hengaw said.

It said a fourth member of the security forces was killed in Mahabad, and firing by security forces killed another person in Sanandaj, Iranian Kurdistan's provincial capital.

Officials have denied that security forces have fired on protesters, and have previously reported around 20 members of the security forces killed during the nationwide unrest.

Reuters could not independently verify the videos and reports.

Iran's Kurds are part of an ethnic minority spread between several regional states whose autonomy aspirations have also led to conflicts with authorities in Iraq, Syria and Turkey.

While violence on ethnic separatists - the Revolutionary Guards have attacked Kurdish Iranian dissident bases in neighbouring Iraq - protesters' chants have stressed unity against Islamist rule and called for Khamenei's downfall.

During the protests, many women have been publicly removing, waving and burning the headscarves they are required to wear under Iran's conservative dress codes that led to Amini's arrest.

Khamenei advisor Ali Larijani, a former parliament speaker, said "if 50% of our country's women do not practice wearing a full hijab, then the police should not be involved".

"The question here is this: Should the government interfere in all matters such as this one?" he said in comments to Ettela'at daily.

Security forces arrested three human rights lawyers who were protesting in front of the Bar Association in Tehran on Wednesday, human rights lawyer Saeid Dehghan said.

While Iran has used force to crack down hard on the unrest, deploying the volunteer Basij militia alongside the police, there has been no sign yet of the Revolutionary Guards - an elite force - being deployed against protesters.

Iran's top judge said he had ordered tough sentences for the "main elements of riots," a semi-official news agency reported.

"I have instructed our judges to avoid showing unnecessary sympathy ... and issue tough sentences for them while separating the less guilty people," Gholamhossein Mohseni Ejei was quoted as saying.

Iranian state media has reported indictments have been filed against some people detained during the protests, but has not said how many. Rights groups estimated thousands of people have been arrested.

(Reuters)