Simi Valley police said an employee of the Simi Valley Unified School District arrived at Santa Susana Elementary School to clean a classroom at about 7:35 p.m. Monday.
The employee found two Hispanic male juveniles vandalizing the classroom. One juvenile struck the employee in the face and the two fled, leaving in the employee's work vehicle, a Ford van with school district markings.
The unoccupied van was later located.
A Simi Valley police officer observed two juveniles matching the suspects' descriptions behind a Tapo Street business at 8:25 p.m. The juveniles were arrested and booked into juvenile hall on charges of robbery, carjacking, burglary, felony vandalism and criminal-gang participation; one of the suspects was also charged with possession of a dagger, possession of a weapon on school grounds and possession of marijuana.