South African authorities Friday arrested eight police officers accused of being involved in dragging a man down a road while he was handcuffed to the back of a police van.
Crowds chased after the van as the man kicked and writhed. He later died.
The incident was captured on video, sparking outrage in a nation that has seen a series of police brutality incidents recently.
The country's Independent Police Investigation Directorate on Friday arrested the officers, who earlier had been disarmed and suspended, said Zweli Mnisi, spokesman for police ministry.
Tough action will be taken against those involved, the nation's acting police minister said, calling for a speedy independent investigation.
"We view this incident in serious light. We want stern action so that it may send a message to other officers that any untoward conduct will not be tolerated," State Security Minister Siyabonga Cwele said.
It was unclear how many officers are involved in the incident. The commander of the local police station was also suspended pending an investigation, the South African Police Service said in a statement.
The video was captured by cell phone in Daveyton, near Johannesburg, shocking the world for its brazen cruelty.
Shaky but clear, it shows a man in a red T-shirt and white sneakers talking animatedly with police officers.
The officers then handcuff him to the back of a police van, which pulls away, dragging his feet along the road. Officers and bystanders run alongside.