President Jair Bolsonaro orders soldiers to be sent to the region, after pressure from EU leaders.
Demonstrators gathered outside Brazilian embassies to protest against inaction on Amazon fires.
Simon Cheng was reported missing on 8 August after crossing the border for a business trip.
Thousands of people held hands to form a human chain of peaceful protest against a suspended extradition bill.
This weekend's meeting in France brings together the heads of the world's leading economies.
The president hits back at Beijing's plans by hiking tariffs on Chinese imports by another 5%.
Six EU countries are to host 356 African migrants, who were stranded at sea for two weeks.
The financier, who was facing sex charges in the US when he killed himself, had a home in Paris.
The leaders will meet one-on-one on Sunday morning with a post-Brexit trade deal set to be discussed.
Demonstrators throw stones at police, who respond with tear gas in the restive city of Srinagar.
The 11th richest man in the world and his brother had a huge influence on the conservative movement.
The 86-year-old is the most senior liberal justice at the Supreme Court.
The Illinois case comes as US health officials track 149 cases of vaping-related lung illness.
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