Vietnamese authorities have detained and prosecuted three men on terrorism and document forgery charges after they were allegedly caught entering Vietnam illegally from Cambodia on September 18.

The three men have been identified as Nguyen Duc Thuan, Ho Pham Hiep Huy and Thai Cong Truong Son. According to Vietnamese authorities, Thuan was carrying a Norwegian passport, while Huy had an Australian passport. The authorities said the three admitted during questioning that they were members of Viet Tan, an organisation that Vietnam has designated as a terrorist organisation.

Vietnamese authorities allege that the men entered the country illegally using false documents and intended to carry out terrorist and sabotage activities. They are also being investigated over alleged forgery of official documents.

Viet Tan has disputed the authorities’ account, saying Thuan and Huy disappeared in Cambodia on September 18 and were forcibly taken to Vietnam. The organisation has called on the Norwegian and Australian governments and international human rights groups to seek their immediate release.

Vietnamese authorities have said the investigation is continuing and that the case will be handled under the country’s laws.