A man arrested over the fatal stabbing of a 16-year-old girl on a bus is to be charged with murder, police have said.
Christina Edkins was stabbed on a bus on Hagley Road in Birmingham on Thursday, on her way to school in Halesowen.
Police said they would formally charge Phillip Simelane, 22, in the "near future" following authorisation from the Crown Prosecution Service.
Christina's parents said her death had left them "heartbroken".
In a statement released by police, Kathleen and Jason Edkins said she was "bubbly, beautiful and intelligent".
They added: "We are heartbroken by the loss of our beautiful princess, Christina, and it's hard to find words to describe the pain we're all feeling.
"Her family and friends will remember her as an amazing individual with her whole life ahead of her.
"A life that was tragically cut short on that Thursday morning. Our lives will never be the same again."
A post-mortem examination revealed the teenager died from a single stab wound to her chest.
An inquest into her death is due to be opened and adjourned at Birmingham Coroner's Court on Thursday.
On Friday Mr Simelane, from Walsall, West Midlands, was sectioned under the Mental Health Act.
Hundreds of flowers and tributes were left outside Leasowes High School in Halesowen, where Christina was a pupil.
Counsellors were brought in to support pupils and staff after the teenager's death.