Thai police have refused to comment on claims they are "close to making an arrest" in connection with the murder of two Britons on a tourist island.
Police investigating the deaths of David Miller (24) and Hannah Witheridge (23) are trying to trace a man who left Koh Tao the day their bodies were discovered on the island, the BBC reported.
It said the man is believed to be in the capital Bangkok, and that police believe at least three men were involved in attacking the young Britons.
Police colonel Kissana Phathanacharoen refused to comment on the new lines of inquiry.
Mr Miller, from Jersey, and Miss Witheridge (inset), from Norfolk, were found with severe head wounds on the island's Sairee beach on September 15.
A bloodstained garden hoe, believed to be the murder weapon, was found nearby.
Post-mortem examinations revealed Ms Witheridge died from head wounds while Mr Miller was killed by blows to the head and drowning.
Around 150 police have been posted to the island but are so far apparently no closer to finding the killer.
A spokesman for the Royal Thai Police said the force was looking into claims the pair had a row with a Thai man in a bar before they were killed.