About 12 people have been detained in the investigation into a massacre at a beach resort that killed 38 people, mostly British tourists, a Tunisian official said.

Two migrant workers from Myanmar have pleaded innocent to charges that they killed two British tourists on the popular resort island of Koh Tao in southern Thailand.

Two migrant workers from Myanmar were arrested Friday after police said they confessed to killing two British tourists whose battered bodies were found on a beach in southern Thailand last month, in a case that damaged the image of the country's tourism industry.