A Metropolitan Police spokesman confirmed that a 17-year-old boy had been stabbed and had been taken to hospital. His injuries were not believed to be life-threatening.
Police said his family had been informed.
The London Ambulance Service confirmed that an air ambulance had been despatched to the scene and that it took an injured male to an east London hospital as a priority.
The Community Security Trust (CST) said it was liaising with King Solomon High following the stabbing.
A spokesman said: “The CST works closely with King Solomon to ensure it has good security on site.
“We contact the school and Redbridge police following terrible incidents like this, although at this time the motivation remains unclear.”
A spokesperson for Redbridge council said: "We are aware of this distressing incident and our best wishes are with the student and his family."
