The British government has summoned a senior Thai diplomat to express concern about the investigation into the killing of two British tourists in the Southeast Asian country.

Foreign Office minister Hugo Swire says he told Charge d'Affaires Nadhavathna Krishnamra that inquiries into the deaths of Hannah Witheridge and David Miller should be "conducted in a fair and transparent way." Swire said Monday it was vital the victims' families were kept updated, and expressed "concern about the way that the police had engaged with the media on the case."

The battered bodies of Witheridge and Miller were found on a beach on Koh Tao island on Sept. 15. The violent crime damaged the image of Thailand's tourism industry.

Thai police say two migrant workers from Myanmar have confessed to the killings.