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

Holly Bowles, 19, was on critical life support after being poisoned 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 for so many people.”

An officer from the Vang Vieng Tourism Police office, who declined 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 had yet been filed. Staff at the Nana Backpacker Hostel, which was still operating but not accepting new guests, confirmed the manager and owner were among those taken in for questioning.

Tourist police offices are common in Southeast Asia and are established specifically to assist with incidents involving tourists and other foreigners.

The US State Department issued a health alert for citizens traveling to Laos on Friday, warning of “suspected methanol poisoning in Vang Vieng, possibly through consumption of alcoholic beverages containing methanol”, following similar alerts in other countries of whose citizens were involved.

Australia’s prime minister announced on Thursday that 19-year-old Bianca Jones had died in a Thai hospital where she had been evacuated for emergency treatment and that her friend – Bowles – remained in hospital “fighting for her life”.

A 28-year-old British woman, Simone White, also died of suspected poisoning, the British Foreign Office announced.