A relative of an inmate reacts in front of a prison complex in the Brazilian state of Amazonas after prisoners were found strangled to death in four separate jails, according to the penitentiary department in Manaus, Brazil [Bruno Kelly/Reuters]

At least 42 inmates were killed in clashes in separate prisons in northern Brazil on Monday authorities said a day after violence in another jail left more than a dozen people dead.

At least 27 of the victims were in the Antonio Trindade Penal Institute near Manaus, the capital of Amazonas state, where the prisons are located.

The Amazonas state prison agency said the prisoners found dead on Monday all showed signs of asphyxia.

The federal government said it was sending reinforcements to boost security

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