A 14-year-old boy who stabbed his substitute teacher in a row over a mobile phone as other pupils watched will be sentenced later this year.
The teenager, who cannot be named, yesterday denied attempting to murder Vincent Uzomah at Dixons Kings Academy, in Bradford.
But he admitted a charge of causing grievous bodily harm with intent - a plea prosecutors at Bradford Crown Court said they accepted.
Mr Uzomah had only been teaching at the school for a few weeks when he was attacked by the teenager as the lesson began at the start of the school day on June 11.
It is understood the defendant argued with the teacher over a mobile phone after Mr Uzomah asked him to hand it over.
During the confrontation, the 50-year-old teacher was stabbed once in the stomach by the teenager, who immediately fled the school grounds, scaling a fence.
He was stabbed with a kitchen knife the boy had brought from home.
The boy was arrested by police in the city centre following a six-hour search - a move caught on mobile phone video by bystanders.
Yesterday, the boy said "yes, sir" when he confirmed his name and spent much of the rest of the 11-minute hearing with his head bowed.
He was remanded in custody by Judge Durham Hall and will be sentenced later this year, probably in August.