
Miller's friends, whom Somyot did not identify, were at Suvarnabhumi International Airport, about to leave Thailand.
“We have asked the British Embassy in Thailand to ask for their cooperation in staying in Thailand while the investigation continues,” Somyot said.
The bodies of Miller and Hannah Witheridge were found on a beach on Koh Tao island on Monday. The autopsies showed that they were beaten to death.
The victims, both of whom came with a group of friends, checked in separately to the same resort on the island. They were seen on a security camera leaving a party together before their bodies were found.
Somyot said the two of Miller’s friends have been asked to remain in Thailand for 48 hours pending investigation and results of samples DNA collected from the victims' bodies.