Braintree Parent Brings Gun To Elementary SchoolA parent who was removed from a Braintree elementary school was found to have a weapon in their backpack.
Student Charged After Tewksbury School Placed In Lockdown For Threats A 14-year-old male freshman at Tewksbury High School has been arrested; No firearms or other threats were found.
Threat Directed At Maryland School Locks Down Similarly Named Mass. SchoolAn online threat directed at a Maryland school briefly put Northeast Metropolitan Regional Vocational High School on lockdown.
Unfounded Report Of Man In Body Armor Prompts Westfield State LockdownWestfield State University has been placed in lockdown while police search for a suspicious man who was reported on campus.
High School Goes On Lockdown As Police Arrest Aggressive Student A Melrose High School student was arrested and the school was on lockdown Friday morning as officials responded to a potential threat. 
House Speaker Stuck In Weymouth School During LockdownA suburban Boston high school was placed on lockdown with Massachusetts House Speaker Robert DeLeo and another state lawmaker stuck aside.
NH School Locked Down After Student Finds Shotgun ShellA New Hampshire middle school was placed in lockdown on Monday after a student found a shotgun shell inside a locker room.
NH School Locks Its Doors With Gunman ReportPolice have arrested a man after it was reported he had a gun at an apartment complex, forcing a temporary lockdown at a nearby elementary school.
Coyote Captured In Mattapan After Wandering Near School A school in Mattapan was put in safe mode late Thursday morning because a coyote was spotted wandering around outside.
Lockdown At Lincoln-Sudbury High After Shell Casings Found Lincoln-Sudbury High School was temporarily placed into lockdown on Monday after a teacher found two shell casings in the school.
Burlington Bank Robbery Prompts School LockdownsTwo schools in Burlington were placed in lockdown on Wednesday for a few hours while police investigated a bank robbery nearby.
4 arrested in Lawrence drive-by shooting