Officers were called to the Winslow Twp. Middle School shortly before 9 a.m.
Investigators say school staffers had located the airsoft rifle in the student's backpack.
Police say the school and the Board of Education office were placed on lockdown.
Officers determined there was no threat to students and staff, and the lockdown was lifted within a half hour.
The airsoft rifle was confiscated and the juvenile student was taken into custody. Police say the student will be "charged accordingly."
MORE TOP STORIES: