Columbiana County Prosecutor Robert Herron said the boy has been charged with inducing panic, aggravated menacing, carrying a concealed weapon and illegally carrying a firearm in a school zone. Police previously said the boy was 12. Herron said he just turned 13. His name is not being released.
He will be held at a juvenile detention center until Monday, when he will be arraigned, Herron said. If convicted, the boy could be held in custody until he is 21.
No one was hurt and no shots were fired in the incident, which lasted less than five minutes Thursday at McKinley Elementary School in Lisbon, Ohio.
Lisbon is about 25 miles south of Youngstown, near the Ohio-West Virginia-Pennsylvania lines.
The boy said before that "his biological mother was in jail and he wanted to visit her, be with her," said Anthony Krukowski, superintendent of Lisbon schools.
Krukowski told CBS Radio News that the boy walked into his classroom at McKinley Elementary School around 9 a.m. on Thursday, "pointed the gun at the floor and instructed the teacher and students to get on the floor."
"Another student outside the classroom heard what was going on," Krukowski added. "The student got another teacher (who) got the student with the gun to give up the weapon."
Authorities say the weapon was a handgun, and it was loaded.
The boy's father told police the weapon -- a loaded, 9 mm semiautomatic -- had been stored on a dresser top with a fully engaged trigger lock. Police Chief John Higgins said the boy apparently found the key and removed the lock.
School was closed for the rest of the day as a result of the incident. Classes were also canceled for Friday, but the school remained open for students seeking counseling.
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