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In an interview with police Sarmad Nisan, 41, told police he tried braking but, "the speed didn't go down."
The victim was hospitalised with life-threatening injuries following the attack.
More than two dozen people were treated for breathing difficulties at London City Airport.
John Harris died at the St John Ambulance station after he was dropped there critically injured with a gunshot wound to the chest.
Police were called the scene where they found a small group fighting.
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