Australian teen Bianca Jones has become the fourth tourist to have died in a suspected mass poisoning in Laos.

The 19-year-old’s family confirmed her death to the media on Thursday. Hours earlier, the US State Department told the media that an American man died in the tourist town of Vang Vieng.

Two Danish women, aged 19 and 20, also died last week in Laos, authorities confirmed, while Jones’ friend Holly Bowles and a British woman are reportedly on life support in hospital.

The deaths remain under police investigation, but news reports and testimonies from fellow tourists suggest they may have consumed drinks laced with methanol, a deadly substance often found in bootleg alcohol.