It happened just after 4:00 Wednesday morning at Fort Miller School on Dakota and Del Mar avenues.
Fresno Unified called police after a silent alarm went off. Patrol officers arrived on scene and saw four suspects walking out of a classroom with laptops, tablets, and other items. The shocked suspects tried to run, but they were surrounded.
18-year-old Victor Guerrero was booked into the Fresno County jail. Three other suspects, all 17-years-old, were also taken into custody.
Police say all four suspects are Bulldog gang members.