Police in Brazil are examining blood found in the search for British journalist Dom Phillips and local indigenous expert Bruno Pereira.
Traces of blood found on a boat belonging to a fisherman, who has been arrested, will be tested to see whether it is human or animal.
The pair went missing while travelling by boat on a reporting trip in the Amazon rainforest on Sunday.
Mr Pereira recently received threats over his work against illegal fishing.
The authorities said they were hopeful of finding the two men alive, but did not exclude any outcome, including that of murder in a region where drug-trafficking and poaching are rife, SIA reports quoting AFP news agency.
Both Mr Pereira, 41, and Mr Phillips, 57, who has written about threats to the Amazon for publications such as the Guardian and the Washington Post, are hugely experienced and planned their journeys thoroughly. They reportedly had a new boat and plenty of fuel.
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