Thai Prime Minister Prayuth Chan-ocha on Wednesday challenged critics of a police investigation into the murder of two British tourists saying new DNA tests can be done as concern grows that two men arrested over the killings might have been framed.
Two Myanmar men - migrant workers Zaw Lin and Win Zaw Htun, both 21 - were charged with the murder of Britons David Miller, 24, and Hannah Witheridge, 23, whose bodies were found on a beach on the southern island of Koh Tao on Sept. 15.
Post-mortem examination results showed the British backpackers died from blows to the head and Witheridge was raped.
Police said the Myanmar men confessed to the crime and their DNA matched samples taken from Witheridge's body - despite the fact that the two had yet to appear in court to face any charge and speak for themselves.
They later retracted their confessions and said they were tortured into confessing. Police deny that.