According to Phoenix Police, the 16-year-old boy was seen by school staff members with a gun on campus.
"The student fled the campus and after a brief foot pursuit the student temporarily disposed of the firearm," police said in a statement.
Officers found the weapon and took the student into custody.
He will be booked into a juvenile court center.
More Arizona crime news
- Search for Irene Luevano: Police recover car she was last seen in as hope dwindles for family members
- Gilbert man arrested, accused of killing his roommate, police say
- FBI arrests Snowflake man who refused to give up live grenade: sheriff
Tune in to FOX 10 Phoenix for the latest news:
Get breaking news alerts in the FOX 10 News app. It is FREE! Download for Apple iOS or Android.