A 15-year-old boy who stabbed fellow pupil Harvey Willgoose to death during a school lunch break has been detained for at least 16 years.Mohammed Umar Khan, who can now be named following a judge's ruling, took a hunting knife to school and knifed the teenager in the heart in front of horrified children on February 3.Judge: Mrs Justice Ellenbogen.

A 15-year-old boy who stabbed fellow pupil Harvey Willgoose to death during a school lunch break has been detained for at least 16 years.Mohammed Umar Khan, who can now be named following a judge's ruling, took a hunting knife to school and knifed the teenager in the heart in front of horrified children on February 3.Judge: Mrs Justice Ellenbogen.