As city and state leaders come up with their plan to stop an active shooter, the federal government is doing the same. Thursday, the Secret Service released a guide on how to prevent violence in schools.

The 32-page guide is based on nearly 20 years of research. It urges school districts to form threat assessment teams made up of teachers, staff, administrators, coaches, school resource officers and other people in the community.

It's that team's job to identify students whose behavior is concerning, gather information about those students and determine whether law enforcement needs to step in.

The guide also calls for districts to create a way for people to report suspicious behavior. It could be an online form, an email, or a phone number or app. It says it’s important the way to report that behavior is anonymous.

But what good is a tipline if people don't know what to look for? The guide calls for training for all stakeholders, including faculty and staff, students, law enforcement and parents.

The Secret Service said in over 80 percent of mass shootings at schools, at least one other student knew something that indicated a fellow student might commit an act of violence.

You can read the Secret Service’s full guide here.

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