Australian activist Tran Hiep held in Vietnamese prison for political prisoners

An Australian human rights advocate is being detained in a notorious jail for political prisoners in Vietnam it has been revealed after he was missing for 11 days .

Democracy activist Tran Hiep is jailed at B34 Detention Centre of the Ministry of Public Security in Ho Chi Minh City, according to consular correspondence sent to his wife Chloe Dang on Thursday.

“The correspondence (from Vietnamese authorities) notes that Hiep is in good health and is being detained in accordance with local regulations,” the consular note seen by AAP said.

Diep was due to meet his wife at Bangkok’s airport after travelling to the Cambodian capital Phnom Penh to meet with human rights defenders.

But the 51-year-old Melbourne man never boarded his flight and has not been heard from since September 18.

Vietnamese authorities said on September 29 that Hiep, also known as Ho Pham Hiep Huy, had been arrested along with two other activists but did not reveal their whereabouts.

Dang, who has returned to Melbourne, said she was relieved to know his exact location but still worried for his safety.

“After nearly three weeks, I finally got a little more information about my husband,” she told AAP hours after finding out his whereabouts.

“The Vietnamese Government has stated he is in good condition, but I cannot stop worrying until he is able to meet with Australian consular officials.

Dang lamented he had to spend his 51st birthday on Wednesday behind bars.

A United Nations human rights report described the decrepit conditions at the temporary detention facility, including windowless cells and a lack of oxygen with tiny slots in steel doors.

The Department of Foreign Affairs and Trade said it would not comment on individual cases because of privacy reasons.

Vietnam’s Ministry of Public Security said the trio were detained on September 18 while allegedly attempting to cross illegally from Cambodia into Vietnam.

It said they admitted being members of Viet Tan, a pro-democracy diaspora political party which is a proscribed terrorist organisation under Vietnam’s communist government.