A 15-YEAR-OLD boy has been rushed to hospital with "serious injuries" after being stabbed at school.
The teenager was knifed at All Saints Catholic High School, on Granville Road, in Sheffield at 12.17pm today.
Cops have arrested another teen, 14, who remains in custody.
The school remains closed and emergency services are still at the scene.
Granville Road has been blocked off from the tram stop to Fitzwalter Road amid investigations.
The victim's family have been made aware of the incident.
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South Yorkshire Police said there is no further risk to the school and updates will be provided in due course.
Headteacher Sean Pender said in a message to parents the incident involved two students.
He said: "I am writing to inform you that today we have dealt with an extremely serious incident here in school resulting in us going in to a lockdown procedure.
"The incident involved two students, one of whom we believe has been seriously injured. All other students are contained and safe.
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"The police and paramedics are present in school. Once the police allow us to, we will be releasing all students from school.
"I understand the level of anxiety you will be feeling without knowledge of the nature of the incident but at this time I have limited information to share with you whilst we have police and paramedics on site.
"I will endeavour to update you with as much information as possible at the earliest opportunity.
"We ask for your prayers and support at this time."
A spokesperson for the force said: "Following a stabbing at a school in Sheffield, a teenage boy has been detained by police and our officers are on scene.
"At 12.17pm today (Monday, February 3) we received reports of a stabbing at All Saints Catholic High School on Granville Road in Sheffield.
"A 15-year-old boy is in hospital with serious injuries. His family is aware. Emergency services are on scene and the school grounds currently remain closed.
"Granville Road is closed from the tram stop to Fitzwalter Road, and we are urging people to avoid the area while emergency services carry out their work.
"We would like to reassure parents of pupils that we do not deem there to be a further risk at the school and further updates will be shared when possible."