Singer Oliver Tree and YouTuber Gaspi among six killed as two helicopters collide in Brazil

Article excerpt

Brazil's air force has launched an investigation into the incident, which took place over Rio de Janeiro. Two helicopters collided in mid-air over the Brazilian city of Rio de Janeiro on Sunday morning, killing all six people on board. American singer Oliver Tree, 32, and Argentine YouTuber Gaspar Prim, known online as Gaspi, 23, were among the dead.