Updated at 8:06 p.m. ET
A day after the shooting at STEM School Highlands Ranch in Colorado, local officials urged people not to view such attacks as part of life in Colorado.
"These are aberrant acts," 18th Judicial District Attorney George Brauchler said.
This week's attack happened not long after the 20th anniversary of the school shooting in nearby Columbine. The shooting injured eight people and left one student dead. Police say he has been identified by the Douglas County coroner as Kendrick Ray Castillo, 18.