Singer Oliver Tree among 6 killed in helicopter collision over Rio de Janeiro

Two helicopters collided over Rio de Janeiro on Sunday morning and crashed in the city's western zone, killing all six people aboard, including American singer and comedian Oliver Tree, firefighters said. Rio de Janeiro's Military Fire Department said one of the helicopters crashed in the parking lot of a car dealership, where several electric vehicles were parked, igniting a fire that was quickly extinguished. Officials said an investigation is underway to determine the cause of the collision. …