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At least forty-two prisoners have been found strangled to death in four separate jails in Brazil. Officials said the killings appeared to have occurred in clashes between rival gangs. Daniel Gallas is in Sao Paulo. Ten people have died in the last week trying to reach the summit of Mount Everest - more than the total for the whole of last year. At least 45 people have died after a boat sank on Lake Mai-Ndombe in western Democratic Republic of Congo. The majority of those on board were teachers going to collect their salaries.