Brazil's ongoing favela wars have taken a dramatic turn for the bloody—prompting the government to send military troops into Rio de Janiero's notorious Rocinha. This is the most violent of the city's sprawling favelas—informal urban settlements virtually abandoned by the government for anything other than militarized anti-drug operations. The army on Sept. 22 deployed nearly 1,000 troops in Rocinha, responding to a request from the Rio state government, Defense Minister Raul Jungmann told local TV. Rio Times reports that the violence in Rocinha is the deadliest since the launch of a "pacification" program in 2011 to push warring narco-gangs out of the city's favelas.

Peru's Transport and Communications Ministry on Sept. 7 signed a contract with Chinese state-owned engineering giant SinoHydro to build the Hidrovía Amazónica, a mega-project aimed at turning the Amazon's major rivers into arteries for delivering the resources of the rainforest basin to foreign markets. Peruvian firm Construcción y Administración SA (CASA) is also to be a partner in the deal, announced earlier this year by the government's foreign investment arm, ProInversión. With a projected cost of $95 million, the Hidrovía calls for dredging 2,687 kilometers of Amazon waterways to make them navigable year-round. It encompasses stretches of the rivers Marañón and Amazonas (from Saramiriza to Santa Rosa), Huallaga (from Yurimaguas to the Marañón) and Ucayali (from Pucallpa to the Marañón). These rivers usually are too low for commercial navigation during the July-October dry season). Proinversión claims to have carried out a "prior consultation" with impacted communities along the rivers, having won 40 agreements to proceed with work. (Gestion, Sept. 7; El Peruano, July 17; BBC Mundo, July 7)

Prosecutors in Brazil have opened an investigation after reports that illegal gold-miners on a remote Amazon river massacred at least 10 members of an "uncontacted" indigenous band. If confirmed, this means up to a fifth of the entire band have been wiped out. Two gold-miners have been arrested in the case. The killings allegedly took place last month along the Rio Jandiatuba in the Vale do Javari Indigenous Territory, a huge area  in Amazonas state bordering Peru. The region is known as the "Uncontacted Frontier," as it shelters more isolated peoples than anywhere else on Earth. Reports of the massacre only emerged after the miners started boasting about the killings, showing off "trophies" in the nearest town.

Colmbia's highest judicial body, the Fiscalía General, has opened investigations into the slaying six demobilized FARC fighters and nine family members of demobilized guerillas in apparent reprisal attacks since the peace accord took effect late last year. The attacks took place in the departments of Caquetá, Antioquia, Putumayo, Tolima, Cauca and Valle del Cauca. (El Espectador, July 27) But the wave of deadly attacks on social leaders across Colombia has also persisted, in spite of the peace process. Human rights group Global Witness, which annually releases a report on the world's most dangerous countries for environmental defenders, this year names Colombia as second only to Brazil. The group counts 37 environmental activists slain in Colombia in 2016, compared to 26 in 2015. In the first six months of 2017, the figure was already up to 22. (El Colombiano, July 19)

A consortium led by China Three Gorges Corp has agreed to buy a giant hydro-electric plant under construction in Peru from scandal-mired Brazilian company Odebrecht. The Chinese consortium, also including Hubei Energy Group, is reported to be paying $1.39 billion for the Chaglla power plant, which is located on the Río Huallaga in Chaglla and Chinchao districts of Huánuco region. The Chaglla complex has recieved  $150 million in funding from the Inter-American Development Bank and Japan's Sumitomo Mitsui Banking Corp. When completed, it will be Peru's third largest hydro-electric facility.

Brazil's government issued an order Aug. 23 abolishing a vast national reserve in the Amazon in order to open up the area to mineral exploitation. The National Reserve of Copper and Associated (RENCA), covering 46,000 square kilometers (17,800 square miles, an area larger than Denmark), straddles the northern states of Amapa and Pará, and is thought to be rich in gold, iron, manganese and other minerals. It was created in 1984 to protect the rich natural resources of zone. In announcing the dissolution of the RENCA, the Mines and Energy Ministry said the objective of the measure is "to attract new investments, generating wealth for the country and employment and income for society, always based on the precepts of sustainability." But opposition Senator Randolfe Rodrigues denounced the move as "the biggest attack on the Amazon of the last 50 years."

Amid fast-escalating nightmarish narco-violence in Brazil comes disconcerting word that police in Rio de Janeiro seized 60 assault rifles hidden in a shipment of swimming-pool heating equipment that had just arrived on a flight from Miami. Pulse News Agencyreported June 2 that the AK-47s and AR-10s were discovered in the cargo terminal of Rio's international airport. Photos of the haul showed weapons in the foam packaging they were flown in.

Bolivia and Brazil agreed to a joint plan to fight criminal gangs that operate on their shared jungle border, long porous for drug and arms traffickers. The decision was taken at a Brasilia meeting between Brazil's Justice Minister Osmar Serraglio and Bolivia's Government Minister Carlos Romero on May 13. The plan includes establishment of new border checkpoints in the Bolivian outposts of Bella Vista and Puerto Evo and the Brazilian villages of Costa Marques and Plácido de Castro. It establishes mechanisms for sharing intelligence, and operations to secure control of air-space over the border zone. It also calls for joint military training between the two countries.