Samira says she never used to be political. "I worked in sales in Iran. I sold cosmetics," she tells BBC Panorama. But that all changed the day her only child was shot dead in front of her by Iranian security forces. Sixteen-year-old Sevda was taking part in protests against Iran's repressive regime that engulfed the country earlier this year - before the US and Israel launched widespread air strikes which killed the country's supreme leader Ayatollah Ali Khamenei. This was reported by Qazaqyia.kz citing BBC News.

Samira's grief became fury as Iran's authorities then hindered, rather than helped, her search for her daughter's body, she says. "I realised that finding Sevda wasn't the end, but just the beginning of all the harassment they put me through."

Samira made a dramatic escape from Iran on foot, navigating dangerous mountainous terrain. She now lives abroad in hiding, describing herself as a "one-woman army fighting the regime". In a search for accountability and justice after her daughter's death, she is intent on naming the members of the security forces and officials she believes were responsible for firing fatal shots during the protests.

"They'll bring me to the brink of death before they kill me, but finding me won't be easy… Return to normal life? There is no going back," she says.

Samira is among several Iranians the BBC has spoken to since the start of the year. Some, still inside the country, told Panorama they wanted to speak out despite the risks, saying they had found it difficult to hold on to hope once the mass protests had been brutally crushed.

The Iranian embassy in London told Panorama that peaceful and legitimate protests had been hijacked by foreign powers, including the US, which promoted violence, provided weapons and equipment, and compromised public security.

Sevda was killed on 9 January as she and Samira took part in huge demonstrations on the outskirts of the capital Tehran which had begun the previous month. They had been sparked by economic discontent, before escalating into calls for an end to the country's Islamic Republic.

Though Samira denies she was especially political then, she says her daughter was. Sevda's idols were two other young women - Mahsa Amini, whose death in custody after an alleged violation against the mandatory headscarf triggered mass protests, and Nika Shakarami, who was killed during a subsequent uprising against Iran's strict Islamic dress code for women.

"She kept them alive in her thoughts and always wanted to continue their path [of resistance]," Samira says.

The day before Sevda was killed, the numbers protesting had been particularly high. Samira says she and Sevda had responded to a call by Reza Pahlavi, the exiled son of Iran's last shah (king), for demonstrations.

"The security forces had lost control," she says.

The swell in numbers had spooked Iran's government, and the following day a shoot-to-kill order was announced, Samira says. But she had thought it just an empty threat.

"They lied so much in Iran… We couldn't imagine a massacre of that scale."

And they were reassured, she says, by US President Trump's promise that he had their backs. He had told US media on 8 January: "I have let [the Iranian authorities] know that if they start killing people, which they tend to do during their riots… we're going to hit them very hard."

But nevertheless the crowds appeared smaller on the 9th, Samira says. Sevda seemed to know the risks, she says. Her daughter took off her earrings and gave them to her grandmother. She also shared her phone passcode with Samira.

The mother and daughter gathered with the rest of the protesters. Sevda then stood on a dustbin and began leading a chant.

"It seemed there were more forces than people," Samira says of the area where they were. "I don't know how, within one day, they gathered so many… Basijis and IRGC [Islamic Revolutionary Guard Corps] forces."

The IRGC defends the country's Islamic establishment, and the paramilitary Basij Resistance Force are volunteers for the IRGC.