abcnews.go.com

... In April, the son was found researching the 2019 Christchuch mosque shooting in New Zealand -- a tragedy that killed 51 people -- on a school-issued computer, the affidavit said.

He was "subsequently suspended and later in the day attempted suicide with a straight razor causing significant injuries and requiring over 100 stitches," the affidavit noted. The boy attended an alternative school until May 7, according to officials.

His grandmother, with whom he had been staying "on various occasions," contacted police on Monday after she found her grandson "hitting a live bullet with a hammer," the affidavit said.

The middle schooler told his grandmother he received the bullet from Pardo and that she had "guns and ammunition at her house," according to the affidavit.

The grandmother told officials Pardo had been taking the boy to a local surplus store and bought him magazines, a tactical black vest "capable of concealing ballistic plates," a tactical black helmet and various army clothing, the affidavit said.

On Monday, the boy told his grandmother he was "going to be famous" before being picked up by his mom and taken to school, according to officials. ...