Brazilian prosecutors have opened an investigation into three prisons after guards were allegedly filmed torturing inmates.
Several guards can be seen repeatedly using stun guns on inmates who were already under control in the footage shot in Goias state.
The clips are believed have been captured between 2014 and 2015 but was only obtained by prosecutors this week. In one video, prison agents can be seen forcing a prisoner to stand up before using a stun gun to deliver a shock to his rear.
And in another, guards can be seen filming each other as they give an electric shock to an inmate sleeping in a hammock inside a cell.
The footage was brought to the attention of the authorities by another guard who was present during the incidents but did not agree with his colleagues' actions, according to Brazilian newspaper O Globo.Two guards have reportedly been removed from their positions and all other prison agents visible in the footage are under investigation, prosecutors said.
Goias state prosecutor Luciano Miranda called it 'evidence of the chaos installed in the prison system'.
Violence is rife in Brazil's overcrowded prison system. Earlier this year several prison riots left dozens of inmates dead.
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