A 15-year-old boy has died after being stabbed at a school in Sheffield, police have said.
The boy, named locally as Harvey Willgoose, was injured at All Saints Catholic High School, in Granville Road in the city, at about 12:17 GMT.
Police and paramedics were called but the teenager died a short time later.
A 15-year-old boy has been arrested on suspicion of murder and remains in police custody, South Yorkshire Police said.
Assistant Chief Constable Lindsey Butterfield told a press conference the force was working “at pace to build a full picture of what had happened and how this tragedy unfolded”.
“We urge you to be mindful that there are loved ones at the centre of this,” she added.
A large police presence remained at the school and in the immediate area.
All Saints head teacher Sean Pender had sent a message to parents on 29 January about a lockdown at the site.
In it, he said the action was due to “threatening behaviour between a small number of students”.
ACC Butterfield was asked during the news conference about the reports but the officer said she could not share any information relating to it.
She concluded the press conference by urging people to avoid speculation and the sharing of content online “which could be distressing to them [the family] and detrimental to our investigation”.
Police officer approaches camera as numerous emergency vehicles line eaither side of street strung with crime scene tape
The area has been sealed off as police begin investigations
A number of floral tributes and messages have been left outside the school this evening.
One of the messages described the teenager as someone who was “the life of a party” who “brought joy and laughter to everyone who knew him”.
It adds that his “bubbly personality was contagious”.
“I’ll never forget all the moments, all the laughs. You’ll be missed by so many,” it said.
In an emotional statement education minister Catherine McKinnell told the Commons: “My heart goes out to his family, friends and the entire school community at this very distressing time.”
South Yorkshire Mayor Oliver Coppard said he had spoken with Lauren Poultney, the county’s chief constable, and offered her his full support.
“This morning a teenage boy went to school like thousands of others across South Yorkshire but won’t come home; a young man who was a member of our community, with his whole life ahead of him,” he said.
Sheffield-based Anthony Olaseinde is an anti knife crime campaigner for the charity Always an Alternative and said the incident was “heart-breaking”.
“Something like this should not happen,” he said.
He said the charity had held sessions at All Saints and worked with young people at the school.
“I’ve been in the school mentoring with them,” he said.
“We did conflict management sessions. We made a short film raising awareness about knife crime with young people at the school.
“The young people were really engaged and positive.”
He called for better support and resources for organisations working with young people.
