Suspected California library gunman influenced by Columbine shooting and wore matching shirt, officials say

The suspected gunman who unleashed a barrage of gunfire inside a Northern California library on Monday, killing two people, was influenced by the 1999 Columbine High School shooting and other mass shootings, officials said Tuesday.

The suspect, 18-year-old Bradley Scott Sayer, had no known connection to the library or any of the victims, the Chico Police Department said.

Before opening fire, he allegedly conducted a walkthrough of the building, went to his vehicle and grabbed a shotgun.