Arapahoe High School is ranked 34th within Colorado. Students have the opportunity to take Advanced Placement® coursework and exams. The AP® participation rate at Arapahoe High School is 55%.

Each year it grows in usage. In the 2014-2015 school year in Colorado there were 3,467 tips. But even though Arapahoe High students had heard threats and knew the shooter had guns, he wasn't reported.

The report by The University of Colorado Center for the Study and Prevention of Violence found three major failures leading up to the Dec. 13, 2013, shooting at Arapahoe High School.

Centennial, Colorado (CNN) — [Breaking news alert, 10:25 p.m. ET] The gunman at Arapahoe High School has been identified as 18-year-old Karl Halverson Pie ...

CENTENNIAL, Colo. – Carrying a shotgun, a machete, a bandolier of ammunition and a backpack with three incendiary devices, Karl Halverson Pierson entered Arapahoe High School and launched 80 ...

Colorado School Shooting Suspect May Have Been Out For Revenge, Police Say. Girl, 15, ... The gunman, a senior at Arapahoe High School in Centennial, Colo., ...

CENTENNIAL, Colo. (AP/CBS4) - Investigators say the student who killed a classmate before taking his own life at a suburban Denver high school described himself in a diary as "a psychopath with a ...

Authorities believe at least 2 people have been injured in a shooting at Arapahoe High School in Centennial, Colorado, on Friday, Sheriff Grayson Robinson says.

CENTENNIAL, Colo. — Armed with a shotgun, a student entered Arapahoe High School and opened fire, hitting two other students before fatally turning the weapon on himself in the latest incident ...

Claire Davis, 17, was shot in the head by a fellow student at Arapahoe High School. ... Victim of Colorado school shooting clinging to life. Meagan Fitzgerald, Laurie Cipriano and John Bacon.

Colorado lawmakers and parents on Wednesday decried the state’s system for reporting school violence after a fatal shooting at Arapahoe High School did not appear in a statewide discipline ...