A handwritten note listed more than a dozen students and a handful of school employees in DeSoto, Texas as targets.
The young relatives and classmates of the students killed at Sandy Hook Elementary have begun to claim spots of their own in the school safety movement.
Copies of the yearbook, created by a group of students and parents of school shooting victims, will be sent to governors, senators and President Trump.
School districts are responding to increasing parent concerns about exposing their children to traumatic drills.
The kits, which include tourniquets and compression bandages, can save lives outside of active shooter incidents, according to advocates and medical experts.
After two students were shot by police officers after bringing a weapon to school, other Wisconsin schools have been dealing with threats of their own.
An officer at a high school in Waukesha, Wisconsin, shot and injured a student who had a gun and pointed it at law enforcement authorities.
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A 36-year-old Fort Bragg High School custodian faces at least one felony charge after allegedly making a threat directed at the Mendocino County high school.
Police in Los Angeles said Friday they arrested a 13-year-old boy who allegedly threatened to shoot students at his middle school and seized an assault-style rifle with a high-capacity magazine during a search of his house.