Luu Hoang Giang, a worker there said that he had heard an explosion before seeing black smoke and flames. All the workers were quickly evacuated out of the building.
A dozen of fire engines were mobilized to control the fire which was spreading from the fourth and fifth floors of block A4 to block A5.
Thousands of workers gathering outside the company entry led to serious traffic congestion.
This was the third fire breaking out at the company. Pou Yuen Vietnam is a wholly-foreign invested company which specializes in producing sports shoes for export and garments and textiles and has more than 80,000 workers.