A 15-year-old boy has died after he was in stabbed at a school in Sheffield, police have said.It happened at All Saints Catholic High School in Granville Road at around 12.17pm, South Yorkshire Police said.A 15-year-old old boy has been held on suspicion of murder, the force added.

A 15-year-old boy has died after he was in stabbed at a school in Sheffield, police have said.It happened at All Saints Catholic High School in Granville Road at around 12.17pm, South Yorkshire Police said.A 15-year-old old boy has been held on suspicion of murder, the force added.