Police are investigating whether she was the victim of a 'random attack'
Post-mortem tests on a teenage girl attacked on a bus have shown she was killed by a single stab wound to the chest.
Christina Edkins, 16, was travelling to school on a bus in the Hagley Road area of Birmingham when she was stabbed on Thursday. She died at the scene.
A 22-year-old man was arrested near the scene of the attack a few hours later and is currently undergoing questioning by West Midlands police.
Police are investigating whether it was a 'random attack' and say they are not looking for anything else in connection with the killing.
They are urging passengers on the bus at the time to contact them as they have only spoken to eight of the 16 passengers.
The force has released a CCTV image of a man wearing a jacket with a tiger design on the back and have asked anyone who saw him on Thursday between 0600 GMT and 1300 GMT to contact them.
Christina's head teacher Neil Shaw, of Leasowes High School, described her as a 'bright and popular student, who was 'much loved by staff and students'.
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