Two teen girls were arrested on fighting charges after one of them allegedly hit an officer who was trying to break up their fight.
Local television stations said two people were being airlifted to a hospital.
Police used pepper spray and chemical munitions to disperse groups of rioters after they ignored warnings to disperse.
Two women whose children called them when a student was shot inside a Louisville high school described hearing chaos in the background.
PoliceOne Contributor Tony Lambraia discusses the National School Shield Program.
A few officers can be heard on video saying they had been struck by beer bottles.
High school student who was kicked out of school Friday refused to leave, then punched a school resource officer in the face.
An official says four students were believed to be seriously injured at a high school near Pittsburgh, where a student with a knife stabbed or slashed others.
James Burke of the Montgomery County, Ohio Sheriffs Department discusses both the Columbine and Virginia Tech school shootings and gives recommendations on how law enforcement can deal with these formidable foes.
The boy downloaded an app for his phone that uses the real backdrop as the setting for the violent game.
Lt. Col. Dave Grossman discusses the tragedy of the Virginia Tech Massacre, what he describes as the most horrifying account he has ever witnessed.