Detective Chief Inspector Stacey Atkinson said: "Our investigation is at an early stage and we are carrying out extensive enquiries to establish exactly what led to this needless loss of a young man's life. We understand the immense impact and huge shock a tragic incident of this nature will have on the community locally."

"Our neighbourhood police team are working with partners, including schools in the area to offer support and reassurance," Atkinson said. "We have already spoken to a number of witnesses and are keen to hear from anyone who has information about the incident."

"Alfie was a kind and thoughtful boy who had all of his friend's best interests at heart. He was loving, mischievous, adventurous and, as such, extremely popular. He was everything a 15 year old child should be and his life was senselessly taken from him before he had the chance to grow into it," the page reads. "His loss is felt deeply by the whole of Horsforth. A lovely, kind, funny, mischievous, brave and generous young boy lost his life tragically and his family, friends, and all who knew him, would love to give him the funeral and tribute he deserves."

Alfie Lewis was a student at Horsforth School & Sixth Form and turned 15 in September.

Headteacher Paul Bell released a statement on the death of Lewis and said: "You will be aware of a distressing incident in the community today involving a former student who was stabbed on St Margaret's Avenue. The police are aware and are working with the school. Our thoughts and sympathies lie with his [family] at this time while the student is receiving medical treatment."

"We are aware of the distress and upset this has caused students and staff who know the student," Bell said.