A British adventurer who was canoeing alone in the Amazon may have been snatched by pirates, according to Brazilian police.
The 43-year-old woman, who has not been named, was attempting a 6435km solo journey from Peru to Brazil.
She disappeared last week while travelling through a stretch of river which is part of a drugs trafficking route and known for frequent pirate attacks.
Her canoe and belongings were later found on sandbanks on the side of the Solimões River in Brazil's northern jungle state of Amazonas.
Ivo Martins, the state's civil police chief, said: "There are various lines of inquiry. She could have been killed by drugs traffickers, or attacked by pirates, but she could also have been attacked by an animal, or just got lost".