The Union of Indigenous Peoples of Vale do Javari says the investigation should be comprehensive and not just focus on the perpetrators of the crime, but on the agents who support predatory activities in this area.
National Public Safety Secretary Tadeu Alencar said efforts should be in line with data from the research by indigenous expert Bruno Pereira, killed in the Amazon along with British journalist Dom Phillips.
It had been enacted during previous administration and is said to violate international treaties signed by the country. The rule had come into effect only last weekend.
Military police officers will work for 30 days in activities and services essential to the preservation of public order, and the security of people and property.
The ordinance points out in one of its articles that the use of the National Force will occur in articulation with the public security agencies of Pará.