An amateur video that has emerged on social media appears to show Iranian police officers beating a man, running over him with a motorcycle, and then firing at him.
Police said they will investigate the video posted online on November 1. It is not known when the video was recorded.
Some reports suggested that the footage was recorded in the southern Tehran neighborhood of Naziabad, which has been the scene of anti-regime protests triggered by the death in custody of 22-year-old Mahsa Amini, who was detained in mid-September by Iran's notorious morality police for "improperly wearing" her hijab.
RFE/RL could not independently verify the video.
SEE ALSO: IRGC Head Warns Protesters To End Demonstrations As UN Urges Iran To Respect Human Rights"A special order has been immediately issued to investigate the exact time and place of the incident and identify the offenders," the police said in a statement published by Iranian media.
"The police absolutely do not approve of violent and unconventional behavior and will deal with the offenders according to the rules," the statement added.
The video recorded at night in an alley shows about a dozen purported police officers beating a man who is lying on the ground. A person who is recording the scene from a building across the street is heard cursing the aggressors.
“Damn you, damn you," a male voice says in the video.
At one point, a man in police uniform riding a motorcycle appears to run over the man. Shortly after, another uniformed man beats the victim with a baton, then another one shoots him at close range.
The man initially tries to cover his head with his hands. Later, his legs appear to be motionless.
The man recording the scene is heard saying, "He died, he died."
The video comes amid a brutal state crackdown on nearly seven weeks of antiestablishment protests that erupted following the September 16 death of Amini.
Women have removed and burned their hijabs, the mandatory Islamic headscarves, while many of the protesters have called for an end to the Islamic republic. "Woman, life, freedom" and "Death to the dictator" have been among the main chants of the protesters.
The authorities have claimed that Iran's enemies are behind the unrest.
More than 250 people have been killed in the crackdown, according to rights groups. Several thousand more have been arrested, including many protesters as well as journalists, lawyers, activists, digital rights defenders, and others.
Without providing any evidence, Iran's police chief, General Hossein Ashtari, claimed last month that "counterrevolutionary groups abroad" wore police uniforms and fired into the crowds. He claimed some of the alleged fake police officers had been arrested.
Amnesty International said on Twitter that that the video was "another horrific reminder that the cruelty of Iran's security forces knows no bounds."
"Amid a crisis of impunity, they're given free rein to brutally beat and shoot protesters," the London-based rights watchdog added while calling on the UN Human Rights Council to "urgently investigate the crimes."
The shocking scenes have caused outrage among Iranians on social media with many condemning the violence.
"These brutal conditions are a sign that the establishment is on the verge of collapse," Abdollah Momeni, a prominent activist and former political prisoner, said on Twitter, adding that the violence reflected the regime's "fear of the people."
Shadi Sadr, a human rights lawyer and the co-founder of the rights group Justice for Iran, told RFE/RL that the international community needed to do more to pressure the Islamic republic to stop its crackdown on protesters.
"The actions taken by the international community so far have not deterred the Islamic republic from stopping the bloodshed," Sadr said.