A New Zealand citizen poisoned after drinking contaminated alcohol in a popular tourist town in Laos has returned home, authorities said on Monday, as Laos pledged to prosecute those responsible for the incident which has killed six tourists.

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 U.S. citizen has died in a tourist town in the Southeast Asian nation of Laos following reports that multiple travelers suffered suspected cases of alcohol poisoning in the same town after possibly consuming tainted drinks. A State Department spokesperson confirmed to CBS News that the death occurred in Vang Vieng.