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The weapons included a 9mm assault rifle that the teenager's mother had recently bought for him, Montgomery County District Attorney Bruce L. Castor Jr. said. Prosecutors are reviewing her actions.

Pennsylvania Teen Held After Police Find Cache of Weapons

PHILADELPHIA -- A home-schooled teenager who felt bullied amassed a cache of guns, knives and hand grenades and tried to recruit another boy for a possible school attack, authorities said Thursday.

The 14-year-old was taken into custody after police searched his bedroom in a Philadelphia suburb Wednesday evening. He had talked about mounting a Columbine-type attack at Plymouth Whitemarsh High School, authorities said.

The weapons included a 9mm assault rifle that the teenager's mother had recently bought for him, Montgomery County District Attorney Bruce L. Castor Jr. said. Prosecutors are reviewing her actions.

Police also found about 30 air-powered guns, swords, knives, hand grenades, a bomb-making book, videos of the 1999 Columbine High School attack in Colorado and violence-filled notebooks, Castor said. The weapons were plainly visible, he said.

The search did not turn up any ammunition for the most dangerous firearm in the bunch, the assault rifle. Authorities said one of the grenades was operable.

"I do not think an attack was imminent, and I am not certain that an attack was going to occur at all," Castor said. "It could have simply been big talking by a kid."

The teen previously attended middle school in the district but had been taught at home for more than a year after voluntarily leaving school, Castor said. Plymouth Township police searched the home after getting a tip Wednesday from a student and his father.