NEW : 11-year-old claimed a voice in his head told him to shoot a classmate , police document says . The boy was shot and killed by the boy's father after he allegedly threatened him. No one was injured . It comes on the heels of several school-related violent incidents .
NEW : 11-year-old claimed a voice in his head told him to shoot a classmate , police document says . Incident occurred in Vancouver , Washington . No one was injured . It comes on the heels of several school-related violent incidents .