"The death sentence of Mohammad Ghobadlou ... was carried out this morning after 487 days of legal proceedings," the judiciary's Mizan Online website said.

Ghobadlou was found guilty of killing a policeman and wounding five others, Mizan said.

The events took place during nationwide protests sparked by the September 2022 death in custody of 22-year-old Iranian Kurd Mahsa Amini.

Amini had been earlier arrested for allegedly breaking Iran's strict dress code for women.

Hundreds of people were killed, including dozens of security personnel, and thousands more arrested over what officials labelled as foreign-instigated "riots".

Ghobadlou was initially sentenced to death in November 2022 after being convicted of "corruption on Earth for attacking police in Tehran with a car, resulting in the death of one officer and injuries to five others," according to Mizan at the time.

In February 2023, the Supreme Court later granted him a stay of execution and later referred his case to a new jurisdiction to deal with issues relating to his mental health, according to a report by Iran's Mehr news agency in July.

On Tuesday, Mizan said the Supreme Court had approved the death sentence against Ghobadlou which was carried out with respect to qesas (Iran's Islamic law of retribution).

Ghobadlou's execution brings to eight the total number of people executed after being convicted of murder or other violence against security force personnel during the protests.

Iran executes more people per year than any other nation except China, according to human rights groups including Amnesty International.

Iran generally carries out executions by hanging.