According to Son La provincial police, the accident happened at around 10.30 am when the passenger coach was travelling through Van Ho Commune and fell about 100 metres down a ravine.
A 39-year-old woman died at the scene, while another woman, aged 42, died while receiving emergency treatment at hospital. Five other injured passengers are being treated at Mai Chau General Hospital in Phu Tho Province.
The coach was severely damaged in the crash.
The scene of the crash (Photo: Trung Hieu).
Initial findings by police suggest the accident was caused by the steep road, multiple sharp bends and the narrow roadway, combined with the driver being unfamiliar with the route and losing control of the vehicle.
A traffic police officer from Son La Province's Police Department investigate the cause of the accident (Photo: Trung Hieu).
Authorities in Son La are continuing to investigate the incident.