Two days after Dom Phillips disappeared, his wife appeals to Brazil to locate 'the love of my life'.
Mr Pereira, 41, is an expert on isolated tribes in the Amazon and is currently on leave from his post with the government's indigenous affairs agency Funai.
But there has been criticism of the small number of police and navy personnel deployed in what is a vast expanse of rainforest crisscrossed by many rivers. "Two people in a boat in a region like that, completely wild - it's an unadvisable adventure. Anything can happen," Bolsonaro said, according to AFP news agency.Image caption,The huge region, which borders Peru, is home to around 6,300 indigenous people from more than 20 groups and is threatened by illegal miners, hunters, loggers and coca-growing gangs.
The men had been travelling by boat in the Javari Valley to interview members of an indigenous guard,The area - in the west of Amazonas state, near the border with Peru - has seen incursions from illegal loggers and miners.The rights groups said the pair arrived at 06:00 local time and set off shortly afterwards towards Atalaia do Norte, a journey which takes around two hours.