Police in the southern province said Sunday they were investigating a work accident at the Scancom Vietnam company in the Song Than 1 industrial park, where a fire had broken out two days ago.
The blaze had happened in the afternoon, at a location full of wood dust and other flammable particles. Firefighters dispatched to the scene put out the flames.
As the authorities were about to depart, wood dust from a tank from up above fell down on a group of workers who were cleaning things up and putting out the remaining embers.
They were hospitalized quickly, but three suffered severe burns and succumbed to their injuries later.