"Hijack", to commandeer or to take control without authority.
"School", any public or private preschool, headstart facility, elementary, vocational or secondary school, college or university.
"Serious bodily injury", bodily injury which results in a permanent disfigurement, protracted loss or impairment of a bodily function, limb or organ, or substantial risk of death.
Mass. Gen. Laws ch. 269, § 14