HARBORCREEK, Pa. (AP) -- A 14-year-old Pennsylvania boy has been charged with fatally shooting his grandmother during an argument over school.

Hunter Riley Reeser, of Harborcreek Township, is jailed without bond on charges including criminal homicide and first-degree murder.

State police say he shot 60-year-old Sandra Orton in the head, then called her husband Tuesday claiming he found her wounded. Police say Reeser later called 911 and acknowledged shooting her.

Police say Reeser told them he shot her because he didn't want to go to an unspecified school meeting.

GoErie.com, which says mental health counselors were at the boy's school district on Wednesday, reported:

State police investigators wrote in the affidavit of probable cause filed with the criminal complaint against Reeser that Reeser told investigators that Orton arrived at the Sawmill Road residence at about 7:25 a.m. Tuesday to take him to a scheduled meeting at school. Reeser did not want to go to the meeting and when Orton arrived he removed a rifle from his bedroom, went to the front porch of their residence and shot Orton through the window of the vehicle, investigators wrote in the affidavit.

In Pennsylvania, children must be charged as adults in murder or homicide cases, though defense attorneys can later try to move the charges to juvenile court. Erie County prosecutors say they plan to oppose that.

Reeser doesn't yet have an attorney to comment on the charges.