MANCHESTER, ENGLAND — A major UK secondary school was plunged into an emergency lockdown on Tuesday, June 9, 2026 after a knife attack left three people injured and sent waves of panic through the student body. Armed police units flooded the grounds of Co-op Academy Manchester in Higher Blackley following reports of a student wielding a blade on campus.

Greater Manchester Police (GMP) confirmed that a teenage girl has been arrested in connection with the incident, which authorities are treating as an isolated but highly severe assault.

The incident unfolded during the school day, instantly triggering the academy's critical incident protocols. As the alarm sounded, teachers rushed to lock classroom doors, barricading students inside as they were instructed to hide under desks and stay away from windows.

North West Ambulance Service (NWAS) dispatched a massive response to the scene, including multiple ambulance crews, advanced paramedics, and specialized hazardous area response teams (HART).

Emergency medical staff treated three individuals at the scene for stab and slash wounds. Two students sustained non-life-threatening injuries and were stabilized before being transported to a local hospital, while one staff member suffered minor injuries and was treated on-site after reportedly attempting to intervene and disarm the suspect.

An NWAS spokesperson confirmed all three victims are in stable condition and none of the injuries are believed to be life-threatening.

Dozens of police vehicles, including dog units and armed tactical officers, cordoned off Plant Hill Road surrounding the school. Officers swiftly swept the building, locating and detaining a female pupil within minutes of arrival.

The suspect was arrested on suspicion of section 18 assault and possession of an offensive weapon in a public place. She remains in custody for questioning.

"This is a deeply distressing incident for everyone involved, but I want to reassure the community that we acted swiftly to secure the site," said Greater Manchester Police Superintendent Simon Handy. "We have a suspect in custody and are not looking for anyone else. Officers will remain at the school throughout the week to provide a visible, reassuring presence for pupils and parents alike."

Outside the gates, hundreds of anxious parents gathered after receiving frantic text messages from their children inside. Many expressed fury and heartbreak over the breach of school security, demanding answers as to how a weapon was brought onto the premises.

Co-op Academy Manchester, which educates over 900 pupils aged 11 to 16, released a statement confirming the school would remain closed for the remainder of the day to assist police with their forensic investigation.

A spokesperson for the Co-op Academies Trust stated: "The safety and well-being of our pupils and staff is our absolute priority. We are shocked by today's events and are cooperating fully with Greater Manchester Police. Full psychological support and counseling services will be made available to all students and staff members affected by this traumatic event."

The academy is expected to review its current on-site security measures, including entry protocols, as community leaders’ call for a wider investigation into youth knife crime across the region.