Air surveillance images showed the tribe in the Javari Valley close to the border with Peru, according to Fabricio Amorim of the National Indian Foundation (Funai).
The flights showed four large villages featuring huts and plantings of corn and bananas by the community, Funai said.
"The plantation, as well as the huts, are new, dated to a maximum of one year," said Mr Amorim.
"The state of the straw used in construction and the planting of corn indicate this. Besides corn, there was bananas and a vegetation in undergrowth that appeared to be peanuts, among other crops." The flyovers were carried out after small forest clearings were detected on satellite images, indicating the possibility of human settlements.
Brazilian authorities ban the general population from any contact with the isolated tribes due to concerns that they could easily become infected with diseases for which they carry no immunity.
The region is already threatened by illegal logging, fishing and gold mining operations and by drug traffickers operating in the area, according to Funai officials.
The newly discovered group probably belongs to the Pano linguistic community which lives in the area, Mr Amorim said.
Funai has not established contact with the group but said that the Javari Valley is regarded as having the "highest concentration of isolated groups in the Amazon and the world" and could be home to 2,000 indigenous people from at least 14 tribes.
UK hospital accused of selling body parts for booze 2014 07 31 A leading cancer hospital is to be investigated following allegations that one of its staff members exchanged human body samples for whisky and cash.
The calls to investigate Christies NHS foundation trust came after the accusation was made by an anonymous whistleblower, prompting British MP Rosie Cooper to contact the watchdog, the Human Tissue Authority (HTA), the Manchester Evening News reports.
15 dead, over 220 injured as multiple gas explosions hit Taiwan city 2014 07 31
Several blasts have ripped through Kaohsiung, a city in south-western Taiwan, killing 15, injuring over 220 and overturning the cars in the street, the Fire Agency said. The cause is thought to be gas leaks in the sewage system.
The number of those injured is expected to rise, the Fire Department said. Many were also taken to schools across the city ...
TYPOGRAPHICAL ERROR on front page of alleged U.S. criteria for terrorist list 2014 07 31 We highlighted the recent report from Glenn Greenwald’s site, The Intercept, about the United States administration’s ’Terror Watch List’, and how "a 166-page document issued last year by the National Counterterrorism Center, spells out the government’s secret rules for putting individuals on its main terrorist database".
Read: BLACKLISTED: The Secret Government Rulebook For Labeling You a Terrorist
A reader with a sharp ...
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As previously reported, as many as 841 scientists and staff members at a US Centers for Disease ...
‘Catastrophic’: Hedge fund billionaire Paul Singer warns of EMP 2014 07 31
Imminent: ‘Only a matter of time’ until entire electric grid destroyed by natural or man-made event…
Billionaire hedge fund manager Paul Singer is warning investors – and more broadly, lawmakers and leaders – about the potential destructive power of an electromagnetic pulse, or EMP, which could be triggered by solar events or artificially, via blasts in the atmosphere.
According to Singer, research ...