Police said a student brought a gun to San Jose's Chaboya Middle School on Thursday, marking the fifth such incident on Bay Area campuses in just this past week.
The most recent incident began around 11:35 a.m. when officers responded to a report of a firearm being found on a student at 3276 Cortona Drive, police said.
Several students told a teacher that a 12-year-old boy took the gun out of his backpack and brandished it at them.
The student was taken into custody, said police, who determined that the gun was unloaded. The firearm belonged to the child's father who kept it locked and unloaded at home.
On Thursday, a 14-year-old Milpitas High School student was arrested after allegedly bringing a gun onto campus.
In Santa Cruz on Wednesday, Branciforte Middle School was placed on lockdown after a disassembled gun was found on campus.
A student at the San Ramon-based Twin Creeks Elementary School brought a gun to the campus on Tuesday. His father was arrested Thursday.
On Monday, a student at Village High School in Pleasanton was arrested for allegedly bringing a loaded handgun to campus.
Additional information was not immediately available.
Check back for updates.
Student brings gun to San Jose school Thursday, marking the 5th such incident in Bay Area schools this week. https://t.co/yd5G0Jv6Iv pic.twitter.com/TtpqTlWbUk
— NBC Bay Area (@nbcbayarea) October 28, 2017