James Louis Hutson, 57, of the US, and Anne-Sofie Orkild Coyman, 20 and Freja Vennervald Sorensen, 21, both Danish, were staying at the Nana hostel in Van Vieng, approximately two hours north of the nation's capital Vientiane, when they became ill.

The U.S., Australia and U.K. have issued warnings for travelers in Vang Vieng after several tourists died in a suspected methanol poisoning outbreak.