Two British men are having their DNA tested in connection with the brutal murders of two backpackers in Ko Tao.
The bodies of David Miller, 24, and 23-year-old Hannah Witheridge were discovered on a beach on the idyllic Thai island on Monday.
Deputy National Police Chief Somyot Poompanmoung told ITV News the results could take "a couple of days".
"Once (the results) are in we will know if they can be ruled out of the investigation and if they can be free to go," he said.
Have you ever had a mishap because you were so distracted by your mobile phone? Whether it was walking into a lamp post, tripping over your dog or spilling coffee down yourself before a big date, we want to know how your phone has gotten you into trouble!
Back in May we launched the search for Good Morning Britain's Young Hero, the award will be made at Prince Harry's WellChild Awards.
The winner has been chosen and Dr Hilary is live in Southport to surprise our winner a Ruston.
We've been building up to the return of Downton Abbey on Good Morning Britain all this week. The show is in its fifth series and if you're struggling to wait until Sunday, Richard Arnold has just the thing for you.
He visited Highclere Castle, Home to Downton on Monday morning, and was lucky enough to catch up with the cast during filming of series five.
Most of the hundreds of thousands of Brits who visit Thailand every year leave with happy memories.
But the murders of two British tourists this week adds to statistics that reveal a much darker side to the tropical island paradise. We speak to travel expert Simon Calder.
At the end of this campaign a decision of momentous importance will have taken place, no lives will have been lost, no bullets fired, no bombs will have been detonated.
Both sides in the Scottish independence referendum are gearing up for a crucial final day of campaigning. Three polls put the No vote slightly ahead but observers say it's too close to call.
Meanwhile a group of 14 former defence chiefs has warned that Scottish independence could put the UK at risk of attack.
If we vote to leave there is no going back, it's not like a general election where if it doesn't work out you can kick them out.