Monday's shooting at an Ohio high school left two students dead and three others injured. A teenager is in custody. The shootings occurred in the school's cafeteria.
Connecticut has not seen many such incidents. "Connecticut narrowly averted such an attack in 2007. A Newington High School student was convicted after gathering an arsenal of weapons and planning to attack a list of students that he delineated by ethnicity," according to ct.mirror.org.
In 1985, A 13-year-old Portland Junior High School student was arrested after a school custodian was shot to death and the principal and a school secretary were wounded, according to The Hartford Courant.
Schools at all levels regularly conduct drills that teach children what to do in case of an attack on the school - they practice lockdowns and "code reds" in addition to the traditional fire drills.