“The men on the prison roof laughed as they raised a hand-painted flag emblazoned with the initials of two of Brazil’s most dangerous drug gangs. In the yard below, other gang-members hacked the heads off prisoners from a rival mafia faction and lined them up in a row. The horrific scenes were filmed on a mobile phone during a jail riot on 1 January in which 56 prisoners were butchered near the Amazon city of Manaus – the first in a string of violent incidents in Brazilian prisons this year.”
Source: Trail of slaughter in prisons shocks Brazilians as gang war explodes | World news | The Guardian