updated 12/23/2008 1:09:58 PM ET 2008-12-23T18:09:58

The mother of a bullied teenager who planned an attack on a suburban Philadelphia high school has been sentenced to three months to a year in prison for providing the troubled boy with explosive material and access to firearms she purchased.

Michele Cossey also received five years' probation Tuesday after pleading guilty to one count of child endangerment in September. The 47-year-old Cossey admitted that she gave her son access to a rifle with a laser scope and gunpowder, which investigators said he was using to build grenades.

Prosecutors dropped weapons charges and related offenses.

Fifteen-year-old Dillon Cossey is in juvenile custody after admitting last year that he planned to attack Plymouth Whitemarsh High School in Montgomery County.

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