Three Thai tourists have been arrested by Laotian soldiers in Laotian city of Pak Se while they took photos near a military camp since Sunday and their friends and relatives haven’t heard from them since, the alleged victims’ friend revealed Wednesday.

Chiang Rai resident identified only as Ore told reporters that Thanwa Supakham, 34, Samart Yaothani, 41, and Worapol Khamsena, 36, obtained a 10day permit to drive their Isuzu pickup truck around Laos and departed since July 21.

Read more: The Nation