This video contains disturbing images.
In Brazil protests were registered after the death of a man in police custody.
A visibly edited video posted on social media shows how police personnel reduce the suspect to the trunk of an official vehicle where he is exposed to an unknown gas.
The police report indicates that he became ill on the way to the station and later died at a hospital.
The authorities opened an internal investigation.
CNN contacted the Police seeking comment on the death and the causes for which the man had been arrested.