Pictures of a remote, uncontacted tribe raising their weapons in a threatening manner at a plane have highlighted growing tensions between Amazon basin tribes.

The pictures were taken near the Xinane river in Brazil's Acre State, close to its border with Peru. Brazil follows a policy of not contacting these people, but the community and their dwellings are threatened by illegal logging, mining, cattle ranching, fishing and hunting across the Peru-Brazil border area.

People considered uncontacted by anthropologists react to a plane flying over their community in the Amazon basinReuters

Many indigenous groups, including the Huni Kui, Ashaninka, and Madija, live in villages in the Brazilian rainforest near the border with Peru. Over the past three years, the Ashaninka and Madija say that they have seen more and more incursions on their territory from uncontacted tribes.

The "Bravos," or "Braves," as uncontacted Indians are called in the region, carry out raids on other villages, putting the communities along the Envira River on permanent alert.

"They steal pots, knives, cloth. They live naked, speak another language and don't want to talk. They are at war with everyone. If they get close they shoot arrows at us," Ashaninka cacique (chief) Txate told photographer Lunae Parracho.

One Ashaninka couple, Poshe and Biana, told him that their three-year-old daughter Sawatxo had been taken by the Bravos in the middle of the night some years ago and they haven't seen her since.

ashaninka couple baby
Ashaninka couple Poshe and Biana talk about the kidnapping of their daughter Sawatxo some years ago by uncontacted tribesReuters
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A member of the Ashaninka tribe looks at fresh footprints he found on the grounds of the former government base along the Envira riverReuters
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Ashaninka chief, Txate, walks between buildings of a former government base called the Envira Front of Ethno-environmental Protection, reportedly abandoned in 2011 after an attack by armed men from across the border in PeruReuters
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Ashaninka people hold a meeting to discuss their planned occupation of the former government baseReuters

The photographer visited a village called Novo Segredo, where people of the Huni Kui tribe have established a spiritual healing centre in the forest.

"It's a place where anyone from anywhere can come to be healed," shaman Bainawa told him.

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Spiritual leaders of the Huni Kui tribe perform a ceremony for a sacred samauma (silk-cotton) treeReuters
huni kuni
A spiritual leader of the Huni Kui tribe blows a herbal powder into the nose of a manReuters
huni kui smoking
A Huni Kui man smokes herbs during a ritual in the village of Novo SegredoReuters
huni kui ayuahascua
A Huni Kui man prepares ayahuasca to use in a healing ritual, in the village of Novo SegredoReuters
huni kui hut
A view of the Shubua, or house of prayer, in the Huni Kui tribe's village of Me TxanavaReuters

Further up the river, the chief of the Madija tribe showed the photographer a forest trail used by uncontacted tribes to reach his village.

He said he had followed the trail until he reached their huts. Along the way he picked up objects such as arrows and a ceramic flute that they had handcrafted.

madjia flute
Binai, son of the chief of the Madija tribe, plays a ceramic flute made by uncontacted indigenous people, which his father found and gave to himReuters
An aerial view of deforested jungle inside Ashaninka territory in Brazil's northwestern Acre stateReuters
People considered uncontacted by anthropologists react to a plane flying over their community in the Amazon basinReuters

Read more about photographer Lunae Parracho's Amazon journey on his fascinating blog.