Eight South African police officers who arrested a Mozambican taxi driver, before cuffing him to a police van and dragging him along the street, have been suspended.
The man is reported to have later died in custody.
The incident was recorded by a member of the public and broadcast on television, the BBC reports.
Police Commissioner Ria Phiyega is thanking people for revealing "callous and unacceptable behaviour".
She says the eight officers involved have been suspended and disarmed.
South African President Jacob Zuma is calling the incident "horrific" and "unacceptable".