The pair were last seen on their boat on the Itaquai River - near the entrance of the Javari Valley Indigenous Territory, which borders Peru and Colombia - on the 5 June, disappearing shortly thereafter.
The police did not name the new suspects accused of covering up the murder, adding in a short statement that ongoing investigations aim to"clarify all the circumstances, motives and those involved in the case".
Amarildo da Costa Oliveira, a fisherman who police say confessed to killing the two victims, his brother Oseney da Costa, and a third man, Jeferson da Silva Lima, have been arrested.The suspects allegedly dismembered the bodies, set them on fire and threw them in a ditch, local media has reported.
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