CLEVELAND (AP) — The 14-year-old who opened fire at his high school had been upset with teachers, saying they wouldn't listen to his side of the story regarding a recent after-school scuffle that got him suspended, the teenager's uncle said Friday.

Larry Looney, who lived upstairs from Asa Coon in a duplex, said the two were lifting weights Tuesday when the boy told him about Monday's fight with another student and his three-day suspension.

"He really didn't want to talk about it," Looney said. "He said he really didn't do anything to start it. He said the teachers wouldn't listen to his side of the story.

"I just can't believe he would do anything like that."

Coon shot two teachers and two students Wednesday at SuccessTech Academy then committed suicide. All the shooting victims survived. One teacher remained hospitalized Friday in good condition.

Schools CEO Eugene Sanders said Friday that the school district would place metal detectors and security guards in all schools in response to the shooting spree. The school will reopen Tuesday, Sanders said.