At least 80 inmates have been killed during a riot at a prison in Brazil's rainforest city of Manaus - sparked because of a lack of water, it has been reported.
The bloodbath is now being blamed on rivalry between the city's two main gangs, Family of the North (FDN) and the First Command of the Capital (PCC), Brazil's largest criminal organisation.
A video taken by an inmate inside the prison shows dozens of bodies, some with their clothes removed, piled up on a blood-soaked floor.
Negotiations are continuing to release seven prison staff who are still being held hostage, police said.
Inmates' main demand is the return of the overcrowded jail's water supply, which police said was cut several months ago.
The high-security prison which holds some of the northern Brazilian city's most dangerous criminals, has capacity for 454 inmates but currently holds 1,108.
Authorities have refused to say how many inmates had fled the prison, which is surrounded by jungle, but confirmed that 20 men have so far been recaptured.