But school spokesman Paul Schwalbach said a campus officer was never assigned to Mr. Loughner.

WSJ: Loughner's Prior Behavior Pointed to Signs of Imbalance

"He was a disruptive and an odd, strange sort of character in the class, " Mr. Schwalbach said.

WSJ: Loughner's Prior Behavior Pointed to Signs of Imbalance

Mr. Schwalbach said the outbursts in classrooms and libraries didn't indicate to school officials a mental health problem or other concerns that would draw in local authorities outside of the school.

WSJ: Loughner's Prior Behavior Pointed to Signs of Imbalance