Hina Shamim died after she was knocked down outside university library . The 21-year-old student was due to celebrate her birthday in a few weeks . Crash involved a BMW carrying Dozens children as young as four and a bus . Driver , 34 , arrested on suspicion of causing death by dangerous driving .
Hina Shamim died after she was knocked down outside university library . The 21-year-old student was due to celebrate her birthday in a few weeks . Crash involved a BMW carrying five children as young as four and a bus . Driver , 34 , arrested on suspicion of causing death by dangerous driving .