armed
assassin
attack
attacker
background
backpack
bag
bandit
books
class
classroom
college
concept
control
crime
criminal
danger
dangerous
felony
firearm
gang
gangster
gun
gunman
high
hit
justice
juvenile
killer
mass
murder
object
pistol
public
risk
room
school
security
shoot
shooting
stop
student
supplies
table
terrorist
threat
university
violence
weapon
wooden