Two miners were killed and two others injured when they were hit by a loose minecart in an underground coal mine in Quang Ninh province on Friday.
According to initial reports, two minecarts were being hauled along a slope tunnel towards the main entry of the mine at around 2 p.m. when the coupling that connected them broke.
The loose minecart ran back and hit the four workers below.
Two miners Tran Van Yeu, 40, and Nguyen Van Dong, 27, died at the scene. Dinh Van Trung, 27, and Le Hai Ngoc, 24, were rescued and rushed to Quang Ninh General Hospital with injuries.
It was the second mining accident in Quang Ninh, home to Vietnam's coal industry, this week.
On Aug. 2, one miner died and two others were injured in an explosion in another underground mine.
Initial investigation showed that the workers had accidentally put their picks into an unspent dynamite left in the mind.