A student who killed himself in a violent attack at a Colorado school had apparently intended much more carnageA link has been posted to your Facebook feed. A link has been sent to your friend's email address.Sign in now to share your story.Sign in with FacebookSign in with Google+Be first to contributeAdd Videos or PhotosBe first to contributeAdd More Videos or Photos You've contributed successfully to: Fresh details emerge in Arapahoe High School shootingCheck out your photo or video now, and look for it in USA TODAY online, mobile, and print editions.View Your ContributionYour submission didn’t go through. Please try again.We're experiencing a few technical issues. Try againStudents who were in the library as the Arapahoe High School shooting in Colorado unfolded, say they heard the suspected gunman, Karl Pierson, shout "I'm not perfect" after shooting his classmate, Claire Davis. VPCThe teen who launched Friday's shooting spree at a suburban Denver high school was armed with 125 rounds of ammunition and three incendiary devices and may have planned to attack people in numerous rooms throughout the building, local authorities said Tuesday.
Arapahoe County Sheriff Grayson Robinson said Tuesday that before entering Arapahoe High School, 18-year-old senior Karl Pierson had written the Latin phrase "Alea iacta est,'' which means "the die has been cast" on his forearm, as well as letters and numbers that are linked to the school library and four classrooms.
Pierson, armed with a pump-action shotgun recently purchased at a local sporting goods store, entered the school at about 12:30 p.m., seeking a school librarian and debate team manager who was his intended target. After the librarian was alerted and fled the building, Pierson shot classmate Claire Davis at point blank range in the head before taking his own life.
Davis, 17, remains in critical condition at Littleton Adventist Hospital.
Robinson said Pierson entered the building with three types of shotgun shells, including buckshot and slug rounds - some in bandoliers slung around his chest and waist. He also carried three "functional'' Molotov cocktails and a machete in a backpack.
Pierson managed to fire just five rounds before turning the weapon on himself as a school resource officer closed in on the school library. The incident last just 80 seconds.
Police said the phrase and numbers and letters written on Pierson's arm are an "indicator to investigators of the shooter's plan."
Investigators are trying to determine whether Pierson planned to attack specific students and staffers in the classrooms and library and if he had help.
Arapahoe High students are scheduled to resume classes Thursday.
Contributing: KUSA-TV in Denver.
