A Thai court on Thursday sentenced two Myanmar migrants to death for murdering a pair of British holidaymakers on a paradise island, in a case that sullied the kingdom's reputation as a tourist haven and raised questions over its justice system, AFP reports.

Zaw Lin and Win Zaw Tun were found guilty of killing David Miller, 24, and the rape and murder of Hannah Witheridge, 23, on the diving resort island of Koh Tao in southern Thailand.

"Both defendants are guilty of murder for which the penalty is the death sentence," an unnamed judge told the court, adding they were also "found guilty of rape and conspiracy to hide the crime."