A Colorado school student, who opened fire wounding two students inside the Denver high school premises, had been seeking revenge against a faculty member over an argument, the County sheriff said.
The 18-year old shooter, Karl Halverson Pierson, shot one student before turning the gun on himself and taking his own life, CNN reports.
According to the report, he brought a shotgun to the Arapahoe High School in Centennial School and began shooting after he was confronted by a classmate while looking for a specific teacher.
The teacher left the school after learning he was a target, while the school and others in the area were placed on lockdown, the report added.
The 15-year-old female student, who confronted and was shot by the suspect, was in serious condition and undergoing surgery in hospital.
