The family of veteran British journalist Dom Phillips is urging more action be taken to find him after he went missing in the Brazilian Amazon.
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Mr Phillips, 57, disappeared along with Brazilian indigenous expert Bruno Araújo Pereira in a remote rainforest area while researching a book.
The two had received threats days before vanishing on Sunday morning, say indigenous rights groups.
Both men have deep knowledge of the region.
Forty-one-year-old Bruno Pereira, who is currently on leave from his post with the government's indigenous affairs agency Funai, is an expert on isolated tribes in the Amazon.
Mr Phillips has been living in Brazil for more than a decade and is a long-time contributor to Britain's Guardian newspaper as well as other publications such as the Financial Times and the Washington Post.
He has written extensively about the threats facing the Amazon, including how cattle farming is fuelling an environmental crisis and how illegal gold miners encroach on indigenous territory.
No trace along river route
Two indigenous rights groups sounded the alarm about the men's disappearance on Monday.
In a statement [in Portuguese], they said that the two men had been travelling by boat in the Javari Valley to interview members of an indigenous guard.
The area is located in the west of Amazonas state, near the border with Peru, and has seen incursions from illegal loggers and miners.
On Sunday, the two stopped in São Rafael, where Mr Pereira was scheduled to meet a local leader to discuss joint patrols between indigenous people and residents of riverside communities.