A 15-year-old boy has admitted stabbing a student to death at a school in Sheffield.

Harvey Willgoose, also 15, died after being stabbed in the chest at All Saints Catholic High School in Granville Road on Monday 3 February.

The defendant, who cannot be named because of his age, admitted manslaughter but denied murder, Sheffield Crown Court heard.

He also pleaded guilty to having a blade on school premises.