HANOI, Vietnam (AP) — A landslide buried a passenger bus on a treacherous mountain pass in Vietnam, killing six people and injuring 19 others, as more heavy rain was forecast into the week.

The earth and rocks collapsed onto the bus late Sunday as it was traveling through the Khanh Le pass in the central highlands, state media reported. The winding, 33-kilometer (20-mile) stretch carved into steep mountainsides is scenic and popular with tourists but prone to landslides in the rainy season.

The landslide crushed the front of the bus, trapping many passengers. Rescuers struggled for hours to reach the scene as heavy rain had also caused landslides on both sides of the pass, cutting off access. Rescue teams were only able to reach the bus after midnight, state media said.

The bus was carrying 32 people from Vietnam’s financial capital, Ho Chi Minh City and was traveling from Da Lat in Vietnam’s central highlands to the coastal city of Nha Trang.

The injured passengers were taken to a nearby hospital. State media said two of the dead bodies were still trapped under the debris as the treacherous terrain hindered the work.

Heavy rain is pounding central Vietnam, which earlier was hit hard by Typhoon Kalmaegi. Rainfall through Wednesday is expected to reach 30–60 centimeters (12–24 inches) in parts of central Vietnam, with some areas likely to exceed 85 centimeters (33 inches).

Heavy rain caused flooding and landslides in mountainous areas of Hue city on Sunday, blocking a major highway that runs from northern to southern Vietnam and cutting off several villages. The former imperial capital has already endured historic floods this year.

Vietnam is among the world’s most flood-prone countries, with nearly half its population living in high-risk areas. Scientists warn that a warming climate is intensifying storms and rainfall across Southeast Asia, making floods and landslides increasingly destructive and frequent.