VANG VIENG, Laos — A second Australian teenager who fell critically ill after drinking tainted alcohol in Laos has died in a hospital in Bangkok, her family said Friday, bringing the death toll in the mass poisoning of foreign tourists to six.

Holly Bowles, 19, had been in critical condition on life support following the poisoning in Laos more than a week ago.

"We are so sad to say that our beautiful girl Holly is now at peace," her family said in a statement sent to Australian Network 10 and other Australian media. "We find comfort and solace in knowing that Holly brought so much joy and happiness to so many people."

An officer at Vang Vieng's Tourism Police office, who refused to give his name, told The Associated Press on Friday that a "number of people" had been detained in the case but that no charges have yet been filed. Staff at the Nana Backpacker Hostel, which was still operating but not accepting new guests, confirmed that the manager and owner were among those taken in for questioning.

Tourist police offices are common in Southeast Asia and are set up specifically to help with incidents involving tourists and other foreigners.

The U.S. State Department on Friday issued a health alert for citizens traveling in Laos, warning of "suspected methanol poisoning in Vang Vieng, possibly through the consumption of methanol-laced alcoholic drinks," following similar alerts from other countries whose citizens were involved.

Australia's prime minister announced Thursday that a 19-year-old citizen, Bianca Jones, had died in a Thai hospital where she had been evacuated for emergency treatment, and that her friend — Bowles — remained in a hospital "fighting for her life." A 28-year-old British woman, Simone White, also died from suspected methanol poisoning in Laos, the British Foreign Office said.

An American and two Danish tourists also died, though specifics about the causes of death have not been released.

New Zealand's Foreign Ministry said one of its citizens was sickened in Laos and was a possible victim of methanol poisoning.

Laos is a one-party communist state with no organized opposition and the government keeps a tight lid on information. In this case, officials have released almost no details.