A 16-YEAR-OLD girl killed on a bus on her way to school died from a single stab wound to the chest, police have confirmed.
Christina Edkins was killed shortly after she boarded the double decker in Birmingham during the morning rush hour on Thursday.
Police are investigating whether the "bright and popular" student was targeted in a random attack. A 22-year-old man arrested near the scene is continuing to be questioned by detectives on suspicion of murder.
Post-mortem tests revealed the teenager died from a single stab wound to the chest following the attack on the number 9 bus.
The results came as detectives issued a picture of the suspect as they appealed for witnesses to come forward.
Police have urged anyone who saw the man, who was also carrying a white bag, between 6am and 1pm on Thursday, to contact them. They have also appealed for any passengers who were travelling on the bus who they have not yet spoken to yet to contact them.
Sixteen people are believed to have been travelling on the bus when the stabbing happened, but only half have so far spoken to police.
A 22-year-old man arrested near the scene on Thursday is continuing to be questioned by detectives on suspicion of murder. Police are not looking for anyone else in connection with the stabbing.
Detectives are investigating whether the "bright and popular" student was targeted in a random attack.
Extra police officers were patrolling public transport in the city to reassure commuters.
Detective Superintendent Richard Baker, of West Midlands Police, said: "We know there are a number of passengers who were on the bus yesterday morning when Christina was attacked while she was sitting upstairs.