Street violence raged across Iran as protests sparked by the September 16 death of Amini intensified on the anniversary of a lethal 2019 crackdown.

Amini, a 22-year-old Iranian woman of Kurdish origin, died in the custody of the notorious morality police after her arrest for an alleged breach of Iran's strict dress code for women.

"We'll fight! We'll die! We'll take back Iran!" a crowd of protesters could be heard chanting on a Tehran street, in a video published by the 1500tasvir social media monitor.

In widely shared video verified by AFP, security forces appear to open fire on dozens of commuters at a Tehran metro station, causing them to scramble and fall over each other on the platform.

Another verified video showed members of the security forces, including plainclothes officers, attacking women without hijab headscarves on an underground train.

Organisers of the protests have called for three days of actions to commemorate hundreds killed in the "Bloody Aban" -- or Bloody November -- demonstrations that erupted on November 15, 2019 after a shock decision to hike fuel prices.

The anniversary gave new momentum to the Amini protests, which have seen women burn their headscarves and confront security forces on the streets.

The unrest has been fanned by fury over the brutal enforcement of the mandatory hijab law, but has grown into a broad movement against the theocracy that has ruled Iran since the 1979 Islamic Revolution.

- 'Guards killed' -

State media said "rioters" -- a term Iranian officials use to describe protesters -- killed two members of the Revolutionary Guards and a member of its Basij paramilitary force on Tuesday.

One Guard was shot dead in Bukan, a city in Amini's home province of Kurdistan, and another was gunned down in Kamyaran, a Kurdish majority city in West Azerbaijan province, the official IRNA news agency reported.

The Basij member died after being hit by a Molotov cocktail in the southern city of Shiraz, it added.

A protester was killed on Wednesday in front of the house of one of three demonstrators shot dead the day before by the security forces in Kurdistan province, Oslo-based rights group Hengaw said.

The death of Burhan Karmi occurred in Kamyaran, where tensions were high for the funeral of mobile phone repair shop owner Fuad Mohammadi, the rights group said.

"Brother Fuad is a hero, the martyr of Kurdistan," crowds of mourners chanted, in videos posted on social media.

Special forces also opened fire on students Wednesday after entering Kurdistan University in the flashpoint western city of Sanandaj, Hengaw said.

Iran Human Rights (IHR), another Oslo-based group, said in an updated toll issued on Wednesday that security forces had killed at least 342 people, including 43 children and 26 women, in the crackdown since Amini's death.

The toll represents an increase of 16 since IHR issued its previous figures on Saturday.

The rights group said at least 15,000 people have been arrested -- a figure the Iranian authorities deny.

ISNA news agency said another 110 people, including 18 women, were arrested Tuesday in the southern province of Fars after people blocked roads, damaged public property and threw stones at security personnel.

- 'Kidnap or kill plots' -

The judiciary said on Wednesday a revolutionary court handed down three more death sentences over the "riots".

One was convicted of attacking police with his car, killing one, the second had stabbed a security officer, and the third tried to block traffic and spread "terror", its website said.

Another death sentence had been issued Tuesday, after a court on Sunday handed down the first death sentence in connection with the protests that have shaken the Islamic republic's clerical leadership.

IHR director Mahmood Amiry-Moghaddam strongly condemned the death sentences, saying the proceedings were "unfair".

"Protesters don't have access to lawyers in the interrogation phase, they are subjected to physical and mental torture to give false confessions and sentenced based on the confessions by the revolutionary courts.

"We fear mass executions, unless the political cost of executions increases significantly," he told AFP.

Iran accuses Western nations that host Persian-language media, including Britain, of fomenting the unrest.

Britain's domestic spy agency MI5 said on Wednesday that Iran wanted to kidnap or kill UK-based individuals it deems "enemies of the regime", with at least 10 plots uncovered so far this year.