Police have detained a Sydney man jailed in 2012 over the rape and molestation of Indonesian boys as young as eight who was found teaching at a school in north-eastern Thailand. 
Peter Dundas Walbran lashed out at Fairfax Media, attempting to push a camera away, after an Australian Federal Police agent and Thai police escorted him from his apartment.
He was last night being detained in immigration department cells. Police released an 18-year-old Thai man who had been living with Walbran after several hours of questioning.
A police investigator said they had seen Walbran with children from his local neighbourhood several times since Monday.
He is expected to be flown to the capital Bangkok as investigations continue.
That Walbran came to be teaching children in Asia again after being deported from Indonesia to Australia last year raises questions about Australia's National Child Offender Register.
Melbourne investigator Glen Hulley tracked Walbran, 59, to an international school in Ubon Ratchathani, 630 kilometres from Bangkok, where he has been teaching children aged 12 to 17 for eight months.
Walbran was hired to work at the school despite the fact a simple Google search would have shown him to be a convicted paedophile. The revelation has stunned teachers at the Narinukun international school, who worry about the impact it will have on students. They fear the school will collapse if furious parents withdraw their children.
Police raided the apartment, which had been under surveillance, two days after new legislation came into force that criminalises possession of child abuse material, with offenders facing up to 10 years' jail. Thai authorities say they will deport Walbran on grounds of bad character if investigators find he has not offended in Thailand.
Walbran was sentenced to three years' jail on the Indonesian island of Lombok in 2012 for offences that shocked investigators, including rape and abuse of children.
He was suspended in   March 2007 from the exclusive Australian International School in Jakarta after police began investigating him.
Walbran returned to Australia before the investigations were complete and was living at Warriewood, Sydney, when he was extradited to Indonesia in   October 2011. He served just over two years of the three-year jail sentence on Lombok before being deported to Australia in   April last year.
After arriving back in Sydney he left again early this year on a New Zealand passport he acquired in NSW.The Narinukun school cancelled Walbran's work contract on Wednesday.
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