An 18-year old student, Steven Jones, who killed his classmate and wounded three other students in a confrontation on the campus of Northern Arizona University early on Friday has been charged with murder.
Jones, a freshman at the university, was taken into custody after the shooting campus Police Chief Gregory Fowler said, adding that the shooting was the result of a clash between student groups.
"We don't know the facts yet about what brought them together, or what caused the confrontation," Fowler said.
After having appeared in court on Friday afternoon, Jones was charged with one count of first-degree murder and three counts of aggravated assault and ordered held on $2 million bond at a brief court appearance.
The university identified the student who was shot dead as Colin Brough and three wounded students as Nicholas Pratoi Kylie Zientek and Nicholas Piring.
Executive Director of Delta Chi International Fraternity Justin Sherman said the four victims were members of the fraternity but Jones was not.
Deputy Coconino County Attorney Ammon Barker said the incident began as a verbal fight between fraternity members before turning physical.
Jones told police that he was hit in the face and chased by the victims after which he retrieved the gun from his car and shot the group of students. He also said he tried to perform first aid for one of the victims.
"The defendant then ran to his car, retrieved his gun and then went back to the fight," Barker said.
"I just want to be clear, there is no indication of self-defense. The defendant shot four unarmed individuals, killing one of them."
Witnesses identified Jones and university police arrested him.
Obama condemned the shootings, vowing to hasten efforts to curb US gun violence.
Just hours after the Arizona shooting early on Friday police reported another shooting at an apartment complex at Texas Southern University in Houston which killed one person and injured another. The suspect had reportedly been detained.