One student was killed and three were injured when an 18-year-old freshman opened fire early Friday in a confrontation at Northern Arizona University’s campus in Flagstaff, continuing a week of violence and threats against college students across the country.

Steven Jones, a freshman at the school, began shooting after two groups of students were involved in a confrontation, G.T. Fowler, the chief of the campus police, told reporters on Friday. The police were able to take Mr. Jones into custody after he stopped firing and “everything calmed down for a few minutes,” Chief Fowler said.

The episode came eight days after a rampage that left 10 people dead at Umpqua Community College in Oregon, but the renewed sense of urgency that the episode brought to a nationwide debate over stricter gun laws has done little to temper shootings and other threats of violence on university campuses. On Friday, Texas Southern University was put on lockdown after a shooting that killed one person at a campus housing complex, and Governors State University in Illinois canceled classes after a bomb threat. Bomb threats have also been made at Northern Illinois University and DePaul University’s O’Hare campus this week, NBC Chicago reported.

All four of the Arizona victims were members of the same fraternity, Delta Chi, the fraternity’s executive director, Justin P. Sherman, said in an email. Colin Brough was killed in the shooting, and Nicholas Prato, Kyle Zientek and Nicholas Piring were all hospitalized at Flagstaff Medical Center, university officials said.