Thai police charged two Myanmar men on Friday with the murders of British tourists Mr David Miller, 24, and Miss Hannah Witheridge, 23.

Police chief of neighbouring Koh Phangan island, Prachum Ruangthong, said: "The two Myanmar nationals are charged with murder (of both tourists), gang rape (of Ms Witheridge) and stealing."

On Friday, investigators took the two men to the island to re-enact the crime. The suspects were handcuffed and surrounded by scores of police officers.

Authorities said the undocumented migrant workers have confessed to murdering the pair, whose battered bodies were found on Koh Tao on Sept 15.

The suspects have been identified only as Win, 21, and Saw, 23, from Rakhine state.

One of two workers from Myanmar (wearing helmet and handcuffs), suspected of killing two British tourists on the island of Koh Tao last month, is led by police near the site where the bodies of the tourists were found on the island October 3, 2014.

Two workers from Myanmar (wearing helmets and handcuffs), suspected of killing two British tourists on the island of Koh Tao last month, stand near Thai police officers during a re-enactment of the alleged crime, where the bodies of the tourists were found on the island October 3, 2014.

They were wearing bullet-proof vests and white helmets. Mr Kiattipong said both men raped Ms Witheridge, and that the tourists were killed with a wooden stick and a garden hoe, which was found bloodied at the scene.

Thai authorities have dismissed concerns that the men are just scapegoats. Thailand's prime minister Prayut Chan-o-Cha said on Friday:​ "I would like to affirm that this case was not the arrest of scapegoats as it could be proved from the DNA found on the victim."

Citing from the "confessions" of the two suspects, police said they entered Thailand about two weeks before the double murders, at dawn on September 15, and worked at AC Pub as general workers. The men said they hardly left the pub, as they had limited knowledge of the Thai language.

Two workers from Myanmar (wearing helmets and handcuffs), suspected of killing two British tourists on the island of Koh Tao last month, are surrounded by Thai police officers during a re-enactment of the alleged crime.

The two told police that they had raped the woman and killed her, before stealing her mobile phone and other belongings, and destroyed the unit at the back of their living quarters. They said they had continued to work at the pub, as police had prevented all workers from leaving.

The victims were found stripped with several wounds to their bodies close to a beachside bungalow on the island, a diving hot-spot near Koh Phangan in the Gulf of Thailand.

Family members of Hannah Witheridge, one of the two British tourists killed on Koh Tao island, comfort each other at the headquarters of the Royal Thai Police in Bangkok September 18, 2014.

Following the twin murders, Thai tourist authorities announced plans to hand out wristbands to tourists containing their personal details to ensure their safety.

Relatives of murdered British tourist Hannah Witheridge hug ahead of a police briefing at the Thai police headquarters in Bangkok on September 18, 2014.

Relatives of murdered British tourist Hannah Witheridge hug ahead of a police briefing at the Thai police headquarters in Bangkok on September 18, 2014.