An Iranian teenager was sexually assaulted and killed by three men working for Iran's security forces, a leaked document understood to have been written by those forces says.
It has let us map what happened to 16-year-old Nika Shakarami who vanished from an anti-regime protest in 2022.
Her body was found nine days later. The government claimed she killed herself.
We put the report's allegations to Iran's government and its Revolutionary Guards. They did not respond.
Marked "Highly Confidential", the report summarises a hearing on Nika's case held by the Islamic Revolutionary Guard Corps (IRGC) - the security force that defends the country's Islamic establishment. It includes what it says are the names of her killers and the senior commanders who tried to hide the truth.
It contains disturbing details of events in the back of an undercover van in which security forces were restraining Nika. These include:
One of the men molested her while he was sitting on her.
Despite being handcuffed and restrained, she fought back, kicking and swearing.
An admission that this provoked the men to beat her with batons.
There are numerous fake Iranian official documents in circulation, so the BBC spent months checking every detail with multiple sources.
Our extensive investigations indicate the papers we obtained do chronicle the teenager's last movements.
Nika Shakarami's disappearance and death were widely reported, and her picture has become synonymous with the fight by women in Iran for greater freedoms. As street protests spread across Iran in the autumn of 2022, her name was shouted by crowds furious at the country's strict rules on the compulsory veil [hijab].
The Woman, Life, Freedom movement had been sparked just days earlier by the death of a 22-year-old woman, Mahsa Amini. She died from injuries sustained in police custody according to a UN fact-finding mission after being accused of not wearing her hijab properly.
In Nika's case, her family found her body in a mortuary more than a week after she disappeared from a protest. But Iran's authorities denied Nika's death was connected to the demonstration and, after conducting their own investigation, said that she had died by suicide.
Just before she vanished, Nika was filmed on the evening of 20 September near Laleh Park in central Tehran, standing on a dumpster setting fire to hijabs.
Others around her chanted "death to the dictator" - referring to Iran's Supreme Leader, Ayatollah Ali Khamenei.
Unfortunately, this is what real fascist governments do to protesters.
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