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.

Australian teenager Holly Bowles has become the sixth foreign tourist to die from suspected methanol poisoning in Laos. The 19-year-old died more than a week after falling ill in the tourist town of Vang Vieng,

Six tourists, including Australians and a British woman, died in Laos, likely from methanol poisoning. The U.S. State Department warns travelers about this risk. The Laos government is investigating the incident and expressed condolences to the victims’ families.

A fifth person, identified as a British woman, has died in connection with a mass alcohol poisoning incident at a tourist spot in Laos, the British government confirmed Thursday.

An Australian teenager has become the fourth person to die in a suspected mass drink-spiking case in Laos where British tourists have also suffered symptoms of methanol poisoning.