The 16-year-old schoolgirl stabbed to death on a bus in Birmingham this morning has been named as Christina Edkins.
Christina was a pupil at Leasowes High School in Halesowen and was on her way to school at the time of her death.
Police have arrested a 22-year-old man who was spotted "acting suspiciously" after a major manhunt was launched for her attacker.
The unnamed man, who fitted the description of the suspect, was arrested near a Morrisons supermarket after being chased on foot by police.
He is being held on suspicion of murder.
The headteacher at Christina's school, Neil Shaw, described her as a "bright and popular student" who was "much loved by staff and student's alike.
Police are urging witnesses to call their dedicated hotline on 0800 096 0095 or Crimestoppers on 0800 555 111.