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Neb. teen kills school assistant principal

The 17-year-old gunman who opened fire at his Omaha, Neb., high school, killing an assistant principal, had been suspended from class and removed from the building hours earlier for driving on an athletic field, police say.

The 17-year-old gunman who opened fire at his Omaha, Neb., high school, killing an assistant principal, had been suspended from class and removed from the building hours earlier for driving on an athletic field, police said Thursday.

Robert Butler Jr. was escorted out of Millard South High School on Wednesday morning. A few hours later, he returned and shot both the assistant principal and the principal before fleeing and killing himself, police said.

Butler, the son of an Omaha police detective, had transferred in the fall from a school in Lincoln, about 80 kilometres away. He had been cited on New Year's Day for criminal trespassing after driving his car on the school's football field and track, police said.

Millard South High School assistant principal Vicki Kaspar, 58, left, and principal Curtis Case, 45, are seen in photos released by the school. ((Millard Public Schools/Associated Press))

Butler was called out of class at 8:10 a.m. Wednesday to meet with assistant principal Vicki Kaspar. After the two talked in her office, he was escorted out of the school at 9:23 a.m. police said.

Butler walked back into the school's main entrance at 12:45 p.m. and signed in at the office to meet with Kaspar. Police said he had been in her office about four minutes with the door closed before he shot Kaspar. Butler than shot principal Curtis Case.

Police said an unarmed security officer was sitting at a desk outside the offices and saw Butler walking away. Butler pointed a gun at the officer, who took cover and wasn't shot.

Butler also fired at a custodian and missed, and bullet fragments apparently hit a school nurse, who was treated at the scene.

A school resource officer who heard the gunfire called police.

The security officer gave police Butler's name and described his car, and at 1:35 p.m. authorities received a report of a suspicious vehicle about 1.6 kilometres from the school. Officers raced to the car and found Butler inside, dead from a self-inflicted gunshot wound.

May have used father's gun

Authorities also said they believe Butler used a handgun owned by his father. It was probably his father's service weapon, a .40-calibre semiautomatic pistol that can fire up to 15 rounds. Butler fired seven rounds.

Police Chief Alex Hayes said Butler apparently took the gun from a closet. His father works an evening shift and had been home but left to run errands.

People in the school office initially did not realize the first three shots were from a gun because there had been an earlier birthday party. They thought the noise was from balloons popping.

The chaos unfolded on the school's first day back in session after the holiday break.

Kaspar, 58, died Wednesday evening. Case, 45, was hospitalized in serious but stable condition.

Sometime after he was escorted out of the building, Butler posted a rambling message on Facebook about his unhappiness with his new school, but he didn't supply many details. Instead, the expletive-laced note predicted Butler's friends would hear about "evil things" he did.

He wrote that the Omaha school was worse than his previous one, and that the new city had changed him. He apologized and said he wanted people to remember him for who he was before affecting "the lives of the families I ruined." The post ended with "goodbye."