An indigenous 15-year-old boy has been stabbed to death in an Amazonian reserve in Brazil, the latest in a string of murders which have heightened tensions in the region.

Erisvan Soares Guajajara’s body was found on Friday in the Amarante do Maranhão city, on the edge of an increasingly deforested indigenous reserve on the fringes of the Amazon rainforest.

The killing is the fourth in the Guajajara tribe in recent weeks and has further fuelled recrimination and racism in the febrile atmosphere surrounding indigenous people and deforestation.

The Indigenous Missionary Council (CIMI), a charity which advocates on behalf of Brazil’s indigenous population, reported Erisvan had travelled to the city with his father to buy groceries and clothes.

A second man, Roberto Silva, who is not indigenous, was also killed at the same party Erisvan was at.

Brazilian tribal lands under new threat Show all 20 1 /20 Brazilian tribal lands under new threat Brazilian tribal lands under new threat Indigenous Macuxi children play at the community of Maturuca on the Raposa Serra do Sol reservation, Roraima state, Brazil Photos Reuters Brazilian tribal lands under new threat The Macuxi fear the return of farmers, illegal gold miners and poachers, all of whom are emboldened by President Jair Bolsonaro’s rhetoric and his moves to weaken their rights Reuters Brazilian tribal lands under new threat A child from an indigenous tribe eats a watermelon Reuters Brazilian tribal lands under new threat Children play in Uailan river in Romaira state Reuters Brazilian tribal lands under new threat Chief Aldenir Lima, the leader of the 70 communities on the Raposa Serra do Sol reservation next to a monument honouring the tribes and their struggle to secure land rights Reuters Brazilian tribal lands under new threat Sideneia Francisco de Lima, 15, looks out of her house on the reservation Reuters Brazilian tribal lands under new threat Indigenous Macuxi children dance in a ceremony for indigenous leaders Reuters Brazilian tribal lands under new threat Macuxi people play football on the reservation Reuters Brazilian tribal lands under new threat ‘I want to ask the new president Jair Bolsonaro to respect indigenous people and our constitutional rights,’ says community leader Tereza Pereira de Souza, her hair crowned with a headdress of yellow feathers. ‘It took us 30 years to get our land borders legally recognised and registered’ Reuters Brazilian tribal lands under new threat The night sky above the reservation. Brazil’s 900,000 indigenous people make up less than 1 per cent of the population and live on reservations that account for 13 per cent of the territory Reuters Brazilian tribal lands under new threat Macuxi leader Orlando Pereirana da Silva, 73, weighs cattle meat at the community of Uailan Reuters Brazilian tribal lands under new threat A Macuxi cowboy stands on a rock Reuters Brazilian tribal lands under new threat Bolsonaro says they live in abject poverty and hunger and should be assimilated instead of being confined to reservations like ‘zoo animals’ Reuters Brazilian tribal lands under new threat Any attempt to change the reservation’s legal status would likely be opposed by the Supreme Court on the grounds that Brazil’s 1988 Constitution protects indigenous land rights Reuters Brazilian tribal lands under new threat A teacher writes on a board at an indigenous cultural centre Reuters Brazilian tribal lands under new threat Anthropologists warn that removing protections would destroy the traditions and languages of the Macuxi and four other related tribes on the reservation Reuters Brazilian tribal lands under new threat ‘Nature is our life, our blood and our spirit, because it gives us sustenance,’ says Martinho de Souza, a Macuxi shaman. ‘We were born on this land, we live here and we will die here.’ Reuters Brazilian tribal lands under new threat Nearby, in the shaman’s village of Tamanduá, chickens run about. The village is named after a type of anteater, a large mammal in danger of extinction Reuters Brazilian tribal lands under new threat A Macuxi woman takes a shower Reuters Brazilian tribal lands under new threat Macuxi leader Tuchaua Gilmario Pereira in a blue feather headdress Reuters

The local police have handed the bodies over for autopsies and believe they may have died during a fight, the Brazilian version of the Spanish newspaper El Pais reported.

Detectives have told the local press the killings were unconnected to previous murders of indigenous people and therefore could be investigated locally, without calling in the federal police.

But this has been strongly refuted by indigenous advocates. Sonia Guajajara, the executive co-ordinator of the indigenous association ABIP and a leader in Erisvan’s tribe, said it was time the authorities took attacks on her people more seriously.

“Another brutal crime against the Guajajara people,” she tweeted. “Everyone who doesn’t like us feels allowed to kill because they know impunity rules. It’s time to say ENOUGH.”

According to figures from CIMI, murders of indigenous people rose 23 per cent in 2018. Since the far-right Jair Bolsonaro won the presidency there have been increasing reports of conflict between Brazilian loggers and the indigenous people who live in the forests they want to exploit.

Just last week, two other Guajajara leaders were killed in a drive-by shooting on a motorway in another indigenous reserve in Maranhão state. A third leader, Paulino Guajajara, was murdered in an ambush on indigenous land 100km from Amarante do Maranhão in November,

The federal agency in charge of indigenous affairs, Funai, has said it is following the latest case, according to The Guardian. However, other reports suggest Funai have confirmed the police’s account, which has ruled out any connection between Erisvan’s death and “hate crime, dispute over timber, or land”.

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“There is a sequence of violence afflicting the Guajajara people and Funai should look into that,” said Gilderlan Rodrigues, CIMI’s co-ordinator in Maranhão.

Earlier this week, the federal justice minister, Sergio Moro, sent agents from Brazil’s National Public Security Force to “ensure the physical and moral integrity of indigenous peoples, Funai's officials and non-Indians” in the reserve where the drive-by shooting took place.

The measure will only last for 90 days, however, and does not include the Arariboia reserve, where Erisvan lived.

Arariboia has been hit particularly hard by deforestation and seen regular violent clashes between loggers and the Guardians of the Forest, an indigenous volunteer force which patrols protected areas of the rainforest.

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According to Brazil’s Pastoral Land Commission, killings of indigenous leaders are at their highest for 11 years.

Illegal logging gangs, empowered by the rhetoric of Mr Bolsonaro, have swept into vast swathes of the Amazon, triggering increased violence with the indigenous communities who live there.

There is also evidence of growing antipathy towards the indigenous from the Brazilian public in the Amazonian regions, with racist messages calling for further violence rippling across social media and WhatsApp groups in recent weeks.