His comments came days after Iran publicly hanged two protesters in the central city of Isfahan, prompting renewed international condemnation and a rare display of public defiance.
He argued that the executions cannot be separated from the mass killing of protesters during January's nationwide uprising.
"There is no doubt that we have a crime against humanity," Akhavan told Eye for Iran.
“What we actually have in Iran are arbitrary executions. These are killings. They are murders,” Akhavan said. "Specifically, the case can be made that this is a crime of extermination, given the large scale of the killings."
Akhavan, who testified before the UN Human Rights Council during its January special session on Iran, said the scale and method of the killings could support the more specific charge of extermination.
The crime against humanity of extermination involves mass or large-scale killing. Unlike genocide, it does not require proof that the perpetrators intended to destroy a protected national, ethnic, racial or religious group.
Public hangings provoke defiance in Isfahan
Iran publicly hanged Amirhossein Safari and Abolfazl Sepahi on July 28 in Isfahan's Alikhani Square after accusing them of involvement in the killing of four police officers during the January 8 unrest.
The two men were among a group sentenced to death in connection with the case. Golmohammad Mohammadi and Erfan Esfandiari were executed in prison on July 19, while eight others reportedly remain under sentence of death.
The judiciary says Safari and Sepahi took part in the killings. Rights groups, however, have raised serious concerns about the proceedings, including restrictions on access to lawyers and case files, the rejection of potentially exculpatory evidence and the use of televised confessions that may have been obtained under coercion.
UN human rights experts called on Iran to halt the executions one day before the hangings, warning that coerced confessions must not be admitted as evidence and that broadcasting them before trial violates the presumption of innocence.
Rather than intimidating the public into silence, the hangings triggered a rare display of defiance.
Hundreds of people gathered near the execution site before dawn. Videos showed crowds booing police and chanting “shame on you” as the call to prayer rang out. Security forces later dispersed them through surrounding streets, with witnesses reporting the use of tear gas, Tasers and warning shots.
An online campaign opposing the death penalty was shared hundreds of thousands of times within a day. At Ghezel Hesar prison near Tehran, an estimated 1,500 death-row prisoners also staged a hunger strike as part of the “No to Executions” campaign.
“A death sentence which is carried out without any due process and on legal grounds that are entirely unacceptable is not really a lawful execution,” he said. “It becomes a form of murder or extrajudicial execution.”
International human rights law permits capital punishment only for the most serious crimes in countries that have not abolished it and only following strict respect for due process.
Akhavan said many of Iran’s death sentences instead rely on vague national-security charges, including moharebeh, or “waging war against God,” as well as forced confessions and trials in courts that cannot be considered independent or impartial.
“What we’re witnessing today in this surge in executions is not an isolated phenomenon,” Akhavan said. “It is inextricably connected with the events of January and it is really a continuation of the same criminal transaction.”
Article 7 of the Rome Statute defines crimes against humanity as certain acts committed as part of a widespread or systematic attack directed against a civilian population.
From January’s massacre to extermination
The UN Independent International Fact-Finding Mission on Iran previously concluded that serious violations committed during the 2022 Woman, Life, Freedom uprising amounted to crimes against humanity.
Its investigation into the January 2026 crackdown is ongoing. Akhavan acknowledged that the mission must complete its own investigation before issuing formal conclusions, but said his legal assessment is clear.
He cited the internet blackout, restrictions on reporting, allegations that hospitals were pressured to record gunshot deaths as natural causes and accounts of bodies being transported in refrigerated trucks and potentially buried in unmarked graves.
He also pointed to statements by senior Iranian officials depicting protesters as combatants, foreign agents or people “waging war against God,” language he said effectively created a licence to kill.
There is also evidence of snipers, heavy machine guns and armour-piercing ammunition being used against unarmed protesters.
“The case can be made that this is a crime of extermination, given the large scale of the killings.”
Executions as a display of control
Iran carried out at least 2,159 executions in 2025, Amnesty International has said, most in drug-related cases.
Since the January uprising, rights groups have documented a sharp increase in politically motivated executions. Amnesty says at least 52 people have been arbitrarily executed this year for alleged offences connected to the protests following torture-tainted and grossly unfair Revolutionary Court proceedings. At least 60 others remain at risk, including three who were children at the time of their alleged offences.
Public political executions remain comparatively rare. The last widely reported case was the 2022 hanging of Majidreza Rahnavard during the Woman, Life, Freedom uprising.
Akhavan said the return of cranes as public gallows was therefore particularly shocking and appeared designed to project strength and frighten a population that continues to challenge the state.
“Under cover of war, they are escalating executions in order to create fear,” he said.
“The biggest threat to the Islamic Republic is not the US and Israeli military operations, as damaging and unlawful as they may be. It is the Iranian people first and foremost.”
The authorities have now expanded their pressure beyond those facing execution. Tehran’s prosecutor has opened cases against an unspecified number of people accused of opposing executions or supporting defendants linked to the January uprising and the recent war.