Brazilian police say a suspect has confessed to burying the bodies of British journalist Dom Phillips and indigenous expert Bruno Pereira.
Detective Eduardo Fontes said the suspect had taken investigators to a site where human remains were dug up.
He stated that police would now collaborate with Interpol to confirm the identities of the bodies.
The announcement came during a police press conference in Manaus.
The police said they expect to carry out further arrests.
Mr. Phillips, 57, and Mr Pereira, 41, went missing in a remote part of the Amazon rainforest on 5 June.
Two suspects, Amarildo and Oseney da Costa de Oliveira, have been arrested.
Briton Mr Phillips had been a long-time contributor to the Guardian newspaper and had lived in Brazil for more than a decade. He was working on an Amazon book.
Mr. Pereira, a Brazilian on leave from the government’s indigenous affairs agency Funai, specialized in isolated tribes.
On Sunday, some of their belongings, including clothing and a laptop, were discovered.
Indigenous groups claim Mr Pereira was threatened days before the pair went missing for campaigning against illegal fishing in the area.
Mr Phillips’ sister, Sian, previously told the BBC: “I think it’s likely they’ve been ambushed by some illegal criminal activity there, possibly to do with illegal fishing.”
It is an “incredibly distressing and awful situation”, she said.
