The Laotian government has promised to bring perpetrators to justice after a mass poisoning that has killed six tourists including two Australians.

A video that shows Australian teenagers Holly Bowles and Bianca Jones partying in Laos shortly before they died has been uncovered.

Eight staff members of a backpacker hostel in Laos have been detained by local authorities as they investigate the deaths of six foreign tourists from suspected methanol poisoning, according to state-affiliated media in the Southeast Asian country.

The family of a young Australian girl who died in hospital after falling critically ill from a mass methanol poisoning in Laos has urged the local government to prevent other lives from being lost. Bianca Jones died in a Thailand hospital on Thursday, and her friend Holly Bowles’ family confirmed her death the next day.

The father of Bianca Jones has issued a plea to the Laos government after she died from suspected methanol poisoning following a night out.

Laos police have arrested the owner, manager and six staff members of the Laotian hostel at the centre of a spate of fatal ­methanol poisonings as the ­grieving parents of Bianca Jones and Holly Bowles brought their daughters’ bodies back to ­Australia.

Mark Jones says the government of Laos cannot let his daughter's death be in vain, after the 19-year-old girl fell ill and died from methanol poisoning.

The bodies of two Melbourne teenagers who died in Laos after suspected methanol poisoning have been returned home. Bianca Jones and Holly Bowles were among six foreign tourists who died after drinking tainted cocktails.