Panic Button in American schools

Dozens of schools in several U.S. states have installed panic buttons in response to the tragedy in Newtown, Connecticut, where 20 children and six adults were killed in a school.
20 students and six adults were killed after the massacre triggered by a 20-year school in Newtown Sandy Hook

According to CBS News, when the button is activated, it will immediately call the emergency number 911.

"When that happens, we will send all the people I have to see what happened," said a local police officer.

after the massacre of Newtown, were updated all areas of school safety.

And some schools in Alabama have introduced this. Teachers Panic buttons neck wear to react as quickly as possible if a threat.