More than 15 police vehicles, dog teams and a police helicopter were sent to a secondary school after a fight outside its gates.
Two people were hurt and Fir Vale School in Owler Lane, Sheffield, was closed.
South Yorkshire Police described it as "reports of an altercation between a group of students".
Two patients were treated at the scene with minor injuries, the Yorkshire Ambulance Service said.
The school's head teacher, Simon Hawkins, said that all the pupils were safe but the school was closed…