The University of North Carolina at Chapel Hill says a suspect has been arrested for fatally shooting a faculty member in a science building on Monday. UNC officials have yet to identify the staffer who was killed or a possible motive in the shooting, which prompted a campus-wide lockdown that lasted for nearly three hours, and prompted security alerts that disrupted classes at public schools on the first day of the school year.

Meanwhile, in California, investigators say the gunman who killed three and wounded six others at a Southern California biker bar last week was a retired police sergeant who had traveled from Ohio to confront his estranged wife. Former Ventura police officer John Snowling used three handguns and a shotgun during the massacre, all of which he purchased legally.