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This is the horrifying moment a helicopter exploded into a fireball and killed all four people on board.
Shocking footage captures the chopper spinning out of control after reportedly clipping the world's longest zip line, the Ras al-Khaimah wire, near Dubai.
The clip shows the helicopter as it wildly rotates through the air before going up in flames at the side of UAE's tallest mountain Jebel Jais on Saturday.