School associated violent deaths are rare — 17 homicides of school-age youth ages 5 to 18 years occurred at school during the 2009-2010 school year and of all youth homicides, less than 2 percent occur at school, and this percentage has been stable for the past decade.
In 2010, there were about 828,000 nonfatal victimizations at school among students 12 to 18 years of age.
Approximately 7 percent of teachers report that they have been threatened with injury or physically attacked by a student from their school.
In 2009, about 20 percent of students ages 12–18 reported that gangs were present at their school during the school year.
In a 2011 nationally representative sample of youth in grades 9-12:
12 percent reported being in a physical fight on school property in the 12 months before the survey.
5.9 percent reported that they did not go to school on one or more days in the 30 days before the survey because they felt unsafe at school or on their way to or from school.
5.4 percent reported carrying a weapon (gun, knife or club) on school property on one or more days in the 30 days before the survey.
7.4 percent reported being threatened or injured with a weapon on school property one or more times in the 12 months before the survey.
20 percent reported being bullied on school property and 16 percent reported being bullied electronically during the 12 months before the survey.
— Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control