Grieving Australian families feel 'insulted' by silence around the death of two teens in Laos last year.

Bianca Jones and Holly Bowles died alongside four others staying at Nana Backpackers hostel - after accidentally drinking methanol in alcohol shots.

In latest news, up to 13 people may face charges related to food and health security, eliminating evidence, and unlawful business. 

Australian correspondent Oliver Peterson says the parents of the victims have been met with silence from Laos authorities - and they're not happy about it.

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