The fire broke out at around 12.45 am near kilometre 125+900 in Coc San Commune as the bus, registered 29K-074.xx, was travelling from Lao Cai Ward towards Sa Pa.
All 20 passengers were safely evacuated, with no casualties reported.
The blaze destroyed the bus. Authorities are investigating the cause and assessing the damage.
Following the incident, traffic police and Coc San Commune Police directed traffic and secured the area, allowing firefighters and rescue teams to respond.
