The accident occurs at roughly 2:00 p.m. when the boiler used in producing concrete electric posts suddenly explodes, a source said.

The two victims are Nguyen Thi Thu (48) and Dang Quang Ngo (26), residents of Phuc Ha Commune, Thai Nguyen City, Thai Nguyen Province.

Pictured are survivors of the explosion.

Six injured, including one in danger of his life, are hospitalized at Thai Nguyen General Hospital.

Scene of the accident.

Photo: Bao Giao Thong

Photo: Thanh Nien

The explosion also badly damages the firm's electric post workshop and nearby houses.

The cause of the blaze remains under investigation.

Photo: Kien Thuc