Sheriff: Colorado School Shooter Had Planned Larger Attack

Had rounds of ammunition, machetes and Molotov cocktails

A heavily armed teenage shooter who fired a fatal shotgun blast at a fellow student at a Colorado school before killing himself was a "murderer" who intended to claim many more victims, Arapahoe County Sheriff Grayson Robinson said Monday.

The lone victim, 17-year-old Claire Davis, was shot point-blank in the face while she sat in the hallway of Arapahoe County High School in the Dec. 13 attack.

The high school senior, who was apparently a random victim, died eight days later.

Robinson, providing reporters in Centennial, Colo., with additional details on the shooting, said the entire incident lasted only about 80 seconds, 'The Denver Post' reports.