Two youths are being questioned after a 15-year-old boy was attacked at his school with a baseball bat.
The teenager was in the grounds of Hameldon Community College in Burnley, Lancashire, when he was set upon during the lunch break on Friday.
The boy was taken to hospital with head injuries and later discharged. A second pupil, aged 15, who suffered a fit was also treated in hospital.
Police said two youths aged 16 and 17 were arrested on suspicion of wounding.
A spokesman for Lancashire Police said: "Police are continuing to investigate the incident, which is being seen as an isolated incident involving a small number of people."
The injured pupil is Asian, but police said there was "no suggestion" the attack was racially-motivated.
"Police continue to work with staff at the school to make sure any outstanding issues are resolved," the spokesman added.