The young man from an Indigenous Amazonian tribe is receiving medical treatment, while authorities prepare to attempt communication with him.

Meanwhile, Brazil’s Fundação Nacional dos Povos Indígenas (National Foundation of Indigenous Peoples, or Funai) estimates around 100 uncontacted Indigenous groups still live deep in the Amazon rainforest.

In a rare encounter, a young man from an isolated Indigenous tribe approached a riverine community in Brazil's Amazon, the country's Indigenous affairs agency and local witnesses said Thursday.