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The two men found guilty of murdering two British backpackers in Thailand will be put to death after their appeals were thrown out.

Thailand's Supreme Court upheld the death sentences of Myanmar migrant workers Zaw Lin and Win Zaw Htun.

The bodies of Hannah Witheridge and David Miller were found on a beach in Koh Tao, a haven for divers, in September 2014.

Police said Witheridge, 23, had been raped and bludgeoned to death and Miller, 24, had suffered blows to his head.

Their half-naked bodies were found dead on the beach the following morning.

(Image: PA) (Image: PA)

Lin and Htun were arrested soon after the killing and sentenced to death in December 2015, but their supporters said the two were framed and evidence was bungled.

In their verdict, a panel of two judges said the death sentences handed down by lower courts would be upheld as the men had been found guilty of murder and rape on the basis of evidence and forensic results.

The men displayed no emotion as they listened intently to a translator while the verdict was read at a court in the province of Nonthaburi, just north of Bangkok, the capital.

The men's legal team said it would seek a royal pardon within 60 days, as provided in Thai law.

The murders sullied Thailand's image in the tourism industry, which accounts for about 10 percent of the country's economy.

Thai police have faced widespread domestic and international criticism for their handling of the case and the evidence.

A pro-bono legal team defending the men has said evidence collected by police was unreliable and not in accordance with internationally accepted standards, arguing it should not have been used to convict them.

(Image: RUNGROJ YONGRIT/EPA-EFE/REX)

(Image: REUTERS)

The lawyers have also said the accused men were tortured and coerced into making confessions they later retracted.

"The death sentence against the two accused and their conviction should be reversed and quashed," Andy Hall, an adviser to the men's legal team, said in a statement to media.

"DNA and forensics evidence relied on to convict Zaw Law and Wai Phyo, and sentence them to death in the Koh Tao murder case, was fundamentally flawed and unreliable in terms of international standards."

Thai courts have rejected accusations of torture and ruled that DNA evidence linked the workers to the crime.

Hannah and David, who had met on the island while staying at the same hotel, had been bludgeoned to death with a wooden hoe as they walked back to their hotel rooms following an all-night party.

Hannah was also raped before her murder.

In April, a Thai man who raped and murdered a German backpacker was also sentenced to death.

(Image: ViralPress)

Ronnakorn Romruen, 24, pounced on Miriam Beelte, as she visited a historic stone monument on the island of Koh Si Chang, eastern Thailand, on Sunday, April 7.

He brutally raped the 26-year-old before battering her head with a rock to kill her and stop her reporting the attack.

He then concealed her body below leaves on a secluded hillside.

Police arrested the local beach cleaner later that evening and he admitted to raping and killing Miriam, from Hildesheim, Germany.