Brazilian authorities say a young man from an isolated Indigenous tribe who approached a riverine community in Brazil’s Amazon returned voluntarily to his people less than 24 hours later.

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.

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

Reportedly, the villagers believed that the man from the uncontacted Indigenous Amazon tribe contacted them to ask for fire.