Police believe the man and woman were attacked on Sunday night, on the island of Koh Tao.
The victims, whose bodies were found with serious injuries early on Monday, were a 23-year-old woman from Great Yarmouth, Norfolk, and a 24-year-old man from Jersey.
The UK Foreign Office said it was urgently investigating the reports.
Jersey Police said they had been contacted by the British Embassy and were co-operating with the Thai and British authorities who are leading the investigation.
‘Boats blocked’
The bodies were found close to the beach-side bungalows where the pair had been staying.
Local police said both had suffered serious injuries and a garden hoe, believed to have been used in the attack, was found nearby.
Police said they have yet to identify a motive or suspect in the killing of the tourists, who had arrived in Thailand last month.
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