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At least 33 prisoners have been killed in a Brazilian prison with several found decapitated, according to Brazilian authorities.

Local secretary of Justice Uziel Castrol told the BBC he believed a drug gang was responsible for the killings in the state of Roraima.

He said some bodies were found decapitated after the incident in the Penitenciária Agrícola de Monte Cristo.

But he said the situation had now been brought under control.

The killings come after 56 prisoners died during a jail riot in a nearby state on Sunday.

The 17-hour prison revolt in Manaus was reportedly the deadliest in Brazil in years.

Officials say police have recaptured 40 of the 87 prisoners who escaped.