Myanmar migrant worker Zaw Lin (left) and Win Zaw Htun arrive at the Koh Samui provincial court in Koh Samui, Thailand on Dec 24, 2015.

Family members of David Miller, one of the two British tourists killed on Koh Tao island, arrive at the Koh Samui provincial court in Koh Samui, Thailand on Dec 24, 2015.

The mystery of who killed the two British backpackers on Koh Tao island last week still remains unsolved.

But things took an even weirder turn when another backpacker claimed to have been approached by a group of Thai men in a bar.

Sean McAnna, 25, says the men approached him when he was in a bar on the beach in the early hours of Monday morning.

The men soon began asking him pointed questions about the murdered British tourists David Miller, 24, and Hannah Witheridge, 23.

They accused McAnna of killing them and told him: "You're going to hang yourself tonight - we're going to watch you hang".

McAnna believed that the men intended to use him as a "scapegoat" for the murders that happened on Sept 15.

Fearing for his life, he took refuge in a 24-hours supermarket and called the police.

The police have since questioned the men but they have not been arrested.

Thai police are now studying CCTV footage for clues into the recent murder of two British tourists.

The video, which was broadcast by Sky News, is believed to have captured the hours before the pair were killed on Sept 15.

In the images, the male victim, David Miller, was seen shaking hands with an Asian-looking man walking in the opposite direction, wearing a red football shirt with the number nine on his back.

Another video also showed the other victim, Hannah Witheridge, walking near to a stall selling food.

The videos also showed Ms Witheridge visiting bars with friends hours before she was killed.

A policeman searches for clues near the spot where bodies of two killed British tourists were found, on the island of Koh Tao

Thai Prime Minister General Prayuth Chan-ocha apologised on Thursday for criticising tourists who wear bikinis in Thailand

comments that sparked an international outcry following the murder of two Britons there this week.

The bodies of David Miller and Hannah Witheridge were found early on Monday on a beach on Koh Tao, a southern island known for its coral reefs and diving.

Thai Buddhist monks recite prayers during a religious ceremony held in memory of two murdered British tourists

DNA tests failed to yield a breakthrough in the hunt for the killers of two British holidaymakers, whose battered bodies were found on the southern resort island of Koh Tao

Tourists enjoy the nice weather on a beach near the spot where bodies of two killed British tourists were found, on the island of Koh Tao

Tourists carry their luggage after arriving by boat to the island of Koh Tao, where two British tourists were killed earlier this week

The Ocean View Bungalows hotel where two British backpackers who were murdered earlier this week stayed on the southern island of Koh Tao.

Thai forensic investigators inspect a hotel room where one of two British backpackers who were murdered

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

A press conference on the murder case of two British tourists at the Thai Police headquarters in Bangkok

British Consul from the British embassy Michael Hancock listens as Police General Jarumporn Suramanee addresses reporters

Thai police Tuesday ruled out three Myanmar workers in connection with the murder of two young British tourists.

The bodies of David Miller, 24, and Hannah Witheridge, 23, arrived in Bangkok late Tuesday for forensic examination.

They were found naked and beaten to death early Monday near a beachside bungalow on the island.

A bloodied hoe was discovered 35 metres (yards) from the murder scene.

David Miller, 24, and Hannah Witheridge, 23, were found naked and beaten to death early Monday near a beachside bungalow on the island, a diving hot-spot near Koh Phangan in the Gulf of Thailand.

The naked bodies of two British tourists were found beaten to death on a Thai beach Monday.

The unidentified man and woman, both aged 24, were found with several wounds near a beachside bungalow.

A bloodied hoe was found 35 metres (115 feet) from the murder scene, local police official Jakkrapan Kaewkhao told AFP.

Koh Tao is popular with tourists but draws fewer travellers than the neighbouring Koh Phangan, home to the hedonistic "full moon" party.