Late Tuesday morning, a male student was near the school but off school grounds, at Madison Street and Mastic Road, when he was stabbed, police said. A spokeswoman for the school said Wednesday the person arrested was also a male student, but said she had no other information.
The stabbing victim went to the school nurse's office for treatment and then was taken to a hospital.
Suffolk police declined to release the name of the person arrested, the charges or the condition of the student who was stabbed.
Seventh Squad detectives were assigned to investigate the case, which might have begun as a street fight, a police spokeswoman said.