NEW: American singer Oliver Tree has been named as among those killed when 2 helicopters collided in Recreio dos Bandeirantes, Rio de Janeiro.
Oliver Tree has almost 20 million followers on social networks and was in Rio de Janeiro in the middle of a world tour. On June 6 he performed a show in São Paulo and would make his first show in the European phase in Lisbon, Portugal, on July 1.
The artist has more than 11 million monthly listeners on Spotify and has songs with over 700 million plays. His last post on Instagram was a story in a studio with other names in music.
One other victim has been identified as Gaspar Prim, an Argentine youtuber who has almost 7.5 million followers on social media.
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