“We are trying to come to terms with the tragic loss of Christina and we extend our heartfelt sympathy and deepest condolences to her family and friends.
“Christina was a bright and much loved student who will be greatly missed by all who knew her.
“Educational psychologists and counsellors are in school providing support to students, parents and staff and we will continue to work closely with the police.
“We would like to thank everyone for the many offers of support and warm words of condolence, which means so much at this difficult time.”
A 22-year-old man was arrested in connection with the fatal stabbing of a "bright and popular" teenager on a bus as she travelled to school.
West Midlands Police have launched a manhunt after a 16-year-old girl was fatally stabbed on a bus in Birmingham on her way to school.