As the public schools chief prepared a security assessment for the mayor, officials were unable to explain how an armed, suspended student was able to enter his school and shoot four people before killing himself. Schools CEO Eugene Sanders was to present a plan Friday to address whether additional security measures are needed after 14-year-old Asa Coon went on a shooting spree Wednesday at the SuccessTech Academy alternative school. The plan is also expected to address how potential problems among students are identified. Despite 26 security cameras, Coon was able to walk down the hallway of his school with two guns and start shooting. Police were checking the video for clues, and Chief Michael McGrath suggested a classmate could have let him in a back door.

Students said metal detectors were intermittently used, but none was operating Wednesday, two days after Coon had been suspended.

McGrath, asked how Coon got past an armed security guard, said he could not comment. He said police consult with school officials on where to locate metal detectors, based in part on crime in schools.

Charles Blackwell, president of SuccessTech's student-parent organization, said the position of a second security guard had been eliminated because of lack of money.

School officials were also investigating how a number of warning signs from Coon, including threats made last week, apparently went unheeded.

Coon had mental health problems, spent time in juvenile facilities and threatened to commit suicide while in a mental health facility, according to juvenile court records. When he was 12, Coon was charged in juvenile court with domestic violence, accused of attacking his mother.

While on probation, he threw his court papers on the floor and then rammed his body into his mother's head when she tried to pick them up, according to court documents.

His probation officer described the relationship between Coon and his mother as extremely poor, with both using foul and abusive language toward each other.

Coon's family declined to comment Thursday.

He was suspended from school for 10 days last year, according to court records. "The issue was addressed and was resolved," according to his probation officer's report, which did not specify details of the suspension.

Coon was ridiculed by classmates at SuccessTech. He had a tendency not to fight back when teased, but recently got into an after-school scuffle, was suspended and made threats that he would blow up the school or stab everybody.

"This kid finally broke," said Christina Burns, who volunteered at a school Coon previously attended. "He finally lost his mind."

Burns witnessed Coon's troubles with fellow students, recalling an instance in which a child dropped a book on his head and he did nothing. She also remembered verbal abuse over his shabby, at times unclean, appearance.

"They picked on him," Burns said Thursday. "He didn't have decent clothing. He didn't have decent shoes. He had problems. The other children played on that and tormented him at school."

On Wednesday, armed with two revolvers and wearing black jeans, black nail polish and a Marilyn Manson T-shirt - the shock rocker Coon said he chose to worship instead of God - Coon fired eight times and shot two teachers and two students.

One teacher remained hospitalized Thursday.

Coon shot himself behind his right ear with a .38-caliber shot shell loaded with pellets. Coroner Frank Miller ruled the death a suicide.

A preliminary investigation found that Coon entered the school, a five-story converted office building, and went to a fourth-floor bathroom, where he changed clothes and took items out of a duffel bag, possibly the weapons, and put them on his body, McGrath said.

Police found the two guns, .22- and .38-caliber revolvers, a box of ammunition for each and three tactical folding knives, all on or near Coon's body, the police chief said.

McGrath said the guns are older, meaning it will take some time to trace them. He said officials would be talking to Coon's older brother and mother about the weapons.

His older brother, Stephen, was arrested at the family home Thursday on parole violations, said state prisons spokeswoman JoEllen Lyons. She said the arrest was not connected to Wednesday's shooting.

Stephen Coon, 19, said his brother did not get any guns from him but would not answer questions about the shooting.

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Associated Press writers John Seewer and Thomas J. Sheeran contributed to this report.