Story summary
Tran Hiep, a 50-year-old Australian activist from Melbourne who co-founded the Australian Alliance to Combat Human Trafficking, went missing in Cambodia after failing to board his flight back to Bangkok on September 18. He was traveling with Nguyen Duc Thuan, a Norwegian-Vietnamese human rights activist, to meet dissident Vietnamese activists for training. Their disappearance and subsequent alleged abduction by Vietnamese authorities has sparked international concern.
Hiep's wife, Chloe Dang, expressed her worries about his safety and urged the Australian government to press Cambodia for information. Pro-democracy group Viet Tan claims that Hiep and Thuan were abducted by Vietnamese security forces on fabricated charges of terrorism while in Cambodia, a move described as "transnational repression." In response, Vietnam's state media reported they had been detained using forged documents with intent to commit terrorist acts.
Vietnam has now charged the two men along with another alleged member of Viet Tan with terrorism and document forgery. This case highlights tensions between human rights advocacy groups and governments regarding cross-border activism and security claims.
Written for “Vietnamese Abduction Of Activists” on 2026-10-05,
grounded in this article and the 6 other(s) covering the same event.
In short:
An Australian man reported missing in Cambodia has been abducted by Vietnamese authorities, colleagues say.
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colleagues → report → authorities
Hiep Tran, a human rights advocate, travelled to Phnom Penh with a colleague to meet Vietnamese activists.
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Tran → travel → activists
His wife says she is worried about him and accuses Australian consular officials of not doing enough.
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she → say → enough
Pro-democracy group Viet Tan alleges a Melbourne man and his Norwegian Vietnamese colleague, who went missing in Cambodia more than a week ago, were abducted by Vietnamese authorities and forcibly taken to Vietnam, in what it calls an act of transnational repression.
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it → allege → repression
Hiep Tran, 50, and his colleague Duc Thuan Nguyen, 52, have not been heard from since the morning of September 18.
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Tran → hear → September
The pair had travelled to Phnom Penh to meet Vietnamese human rights activists.
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pair → travel → activists
They flew into the Cambodian capital from Bangkok on September 15, and were in regular contact with their families until September 18.
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They → fly → September
They did not board their return flight to Bangkok at 10:30am the next day.
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They → board → 10:30am
Overnight, Vietnamese state media reported the men had been detained, according to Viet Tan, the group both men belong to and which the Vietnamese government considers a terrorist organisation.
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government → report → Tan
Viet Tan said authorities alleged the pair "illegally entered Vietnam from the Cambodian border".
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pair → say → border
But the group rejects that account, saying the men had no intention of entering Vietnam and were abducted in Cambodia, then forcibly taken across the border.
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men → reject → border
The ABC has not seen the state media report but has contacted Vietnamese authorities for comment.
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ABC → see → comment
In a statement, Viet Tan said the claim was a fabrication intended to cover up an abduction that violated Cambodia's sovereignty and international law.
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that → say → sovereignty
The group said the men were travelling to the Kaoh Andaet area of Cambodia when they went missing.
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they → say → Cambodia
"Viet Tan is particularly concerned that To Lam's police state is using its security apparatus to pursue and repress activists and foreign nationals even beyond Vietnam's borders,"the statement said.
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statement → use → Vietnam
Viet Tan has called on the Australian and Norwegian governments to urgently request direct access to the men to confirm their condition and safety.
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Tan → call → condition
It said Mr Nguyen was diabetic and required daily insulin injections, and must be guaranteed access to medication and medical care.
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Nguyen → say → medication
It has also urged both governments and international human rights organisations to pressure the Vietnamese government for the men's immediate and unconditional release.
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It → urge → release
Family's fears
Speaking before news of her husband's detention, Mr Tran's wife, Chloe Dang, said the couple travelled to Thailand for a holiday before her husband made a side trip to Cambodia.
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husband → speak → Cambodia
She said he was a passionate human rights activist but that she feared the men were targeted, or kidnapped, because of their advocacy.
"He always knew there was a risk doing human rights work, but we never thought that this would happen."
Ms Dang was waiting at Bangkok airport when the pair failed to appear, and was told Mr Tran had never boarded the flight.
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Tran → say → flight
"Our last conversation was him checking in on me in Bangkok, making sure I was safe and OK.
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I → check → Bangkok
He always checks in with me," she said.
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she → check → me
She said she had lodged a missing person's report in Cambodia, and was liaising with Australian consular officials, but was worried not enough was being done.
"
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enough → say → officials
I send DFAT [Department of Foreign Affairs and Trade] emails every day and ask for details, but I haven't heard anything
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I → send → anything
since he disappeared,"Ms Dang said.
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Dang → disappeared,"m → ?
A spokesperson for DFAT said it was providing consular assistance to the family of an Australian reported missing in Cambodia, but could not comment further due to privacy obligations.
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it → say → obligations
'Not a normal tourist disappearing'
Phong Nguyen, who represents the group in Australia, said Mr Tran was a long-time advocate who trained activists in digital security.
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who → disappear → security
He previously worked in IT for a large bank and for Telstra, but had left to focus on human rights work.
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He → work → work
Mr Nguyen said the men had been supporting human rights activists for more than 20 years and were meeting activists who were not Viet Tan members.
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who → say → activists
"What's concerning is that this is not a normal tourist disappearing while travelling," Mr Nguyen said.
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Nguyen → concern → ?
Rights groups including Human Rights Watch and Amnesty International have documented the jailing of Vietnamese citizens for online posts and activism.
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groups → include → posts
Mr Nguyen said sentences of 15 or 20 years were not unusual, and that ordinary people were at risk, not only high-profile figures.
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people → say → risk
He also pointed to a rise in transnational repression, where governments targeted critics abroad, claiming there had been a significant increase in the past year in overseas Vietnamese nationals being "captured, kidnapped" and sentenced.
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nationals → point → year
Mr Nguyen pointed to Australian citizen Chau Van Kham, a Viet Tan member who spent four and a half years in prison in Vietnam after his arrest in 2019.
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who → point → 2019
Mr Nguyen said Mr Tran and Mr Thuan understood the dangers of their work, which made their silence even more alarming.
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silence → say → work
"Something must have happened very quickly that they couldn't alert," he said.
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he → happen → ?
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