A 15-year-old boy who prosecutors said was the mastermind of a failed plot to go on a shooting spree in a suburban school was sentenced Friday to six years in state prison.

Edwin DeLeon and three other teens pleaded guilty earlier this year to scheming to shoot teachers and students in April. Authorities said they planned to open fire at Winslow Township High School in Camden County, where DeLeon and two of the others were students, and then turn their guns on other people in the community.

Despite attempts, the teens in the Philadelphia suburb were never able to get a gun. School officials heard about the plans and the boys were arrested before anyone was hurt.

Initially charge[d] with terrorism, the four were arrested after a girlfriend of one reported the plan to school officials.

All four admitted their role in the plan, two in juvenile court and two in adult court. Those in juvenile court have yet to be sentenced. The other in adult court -- Peter Cunningham, 16 -- was sentenced on Sept. 22 to five years.

All four pleaded guilty to conspiring to possess a handgun.

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