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.

At least six tourists who traveled to Laos have died in recent days, prompting international alarm about the dangers of consuming alcoholic drinks that contain methanol.

Simone White was enjoying a holiday with friends in Laos last week when she accepted a free shot from a bar. The 28-year-old British lawyer has now been named as the fifth person to die in a suspected mass methanol poisoning in the backpacking town of Vang Vieng.