Vietnamese officials say 20 people on a bus were swept away by strong currents from a flooded river, while another 17 managed to save themselves by swimming or clinging to trees or power poles.
Nguyen Hien Luong, head of Nghi Xuan district in Ha Tinh province, says the bus was traveling from the Central Highlands province of Dak Nong to the capital when it was yanked off the country's main highway at around 4:30 a.m. Monday.
The driver, along with 16 others, managed to break free from the bus.
He says 20 others remain missing and are presumed dead.
Rescuers are still searching for the bus.