Done in 80 seconds

School security plans in America have changed over the years to include arming teachers, adding police officers and armed security guards, and changing how schools are designed. But that didn't stop the latest tragedy in Colorado. It started just before 12:33pm Mountain Standard Time on Friday, moments after Karl Pierson - a high school senior and debate club member - parked his car in the student lot at Arapahoe High School in suburban Denver, then - wearing a bandolier containing shotgun shells and carrying a pump-action shotgun, a machete, and a backpack holding three Molotov cocktails - walked through a door adjacent to the library. The shooter's target appeared to have been the librarian, who runs the debate team and who had disciplined Pierson early last September. But the librarian, accompanied by a janitor, had departed the school building as soon as the incident began to unfold. "He took no effort to conceal the fact that he was armed," said Arapahoe County Sheriff Grayson Robinson. In less than 80 seconds, Pierson "fired one random shot down a hallway," then entered an area where 17-year-old Claire Esther Davis was seated with a friend, "and shot the female victim point-blank" in the head. "There was no time for the victim to run from the shooter," Robinson told reporters. Pierson then fired another round down a hallway, then entered the library, where he fired again then ignited one of the Molotov cocktails. The cocktail ignited at least three bookshelves, causing smoke to pour into the library. He then fired a fifth round and ran to the library's back corner, "and there took his own life." By 12:35pm, it was all over. "His intent was evil, and his evil intent was to harm multiple individuals," Robinson said about Pierson, whose entrance into the school was documented on security cameras, as was the bulk of the one minute, 20 seconds of violence that ensued on that day so close to the first anniversary of a similar attack at Sandy Hook. Speaking of which, the people of Newtown, Connecticut are remembering the tragedy that convulsed the nation one year ago. A socially awkward young man named Adam Lanza walked into Sandy Hook Elementary School with a rifle on December 14, 2012. Lanza gunned down 20 children (ages 6 and 7) and six adults at the school, then he killed himself. The people in this community of 28,000 in the southwest part of the state hope to grieve in private, and in line with their wishes, town leaders have asked the news media to stay away.