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, Brazilian authorities said.

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

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

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.