A 15-year-old student has been arrested, accused of threatening to shoot people at Omaha's North High School.

School district spokesman David Patton said Tuesday that the boy wasn't armed and made the threats during a confrontation with a student at another district school.

An Omaha police report shows the alleged threat was made and investigated Sept. 7, although the student was not arrested until Sept. 10. An investigating officer noted in the report that the student threatened "to shoot people at the school, causing another Columbine and Von Maur incident by killing people."

The Von Maur comment references the December 2007 Omaha mall shooting in which a gunman killed himself and eight others.

"Columbine" refers to the 1999 shooting at Columbine High School in suburban Denver that killed 15 people.