Tran Ngoc Duc, 31, Le Ngoc Qua, 27, Le Nhat Hai, 21, Nguyen Minh Tien, 26, and Nguyen Quang Minh, 23, are being investigated for "deliberate infliction of bodily harm on another person" and "illegal arrest, detention, or imprisonment of a person."
On August 31 the five were dispatched for patrolling and enforcing social distancing regulations when they found Tran Van Tri, 36, without identification documents and violating safety protocols.
They took him to a police station and assaulted him when he resisted.
At around 9 p.m. the same day they sent him home, but his injuries proved to be too severe and he succumbed to them within a few hours.
Besides assaulting him, they had also unlawfully detained Tri for four hours, the police said.