Two men in uniforms were seen brutally beating another man who lied on the ground in a video clip that went viral on Vietnam's social media.
Nguyen Tan Duc, chief health offcial of Quang Ngai Province, has confirmed that the beating took place at Quang Ngai General Hospital late last month.
He said the incident took place after the guards refused to let a group of relatives visit an in-patient because visiting time was over.
The video showed two guards punched, kicked and insulted a young man. They cornered another man and threatened to beat him.
Duc said some relatives attacked the guards at the same time, but the act were not recorded.
He said the hospital had reported the incident to local police.