A 12-year-old Duvall boy who threatened fellow students at Tolt Middle School in Carnation and harassed members of his family was sentenced Thursday to more than a year at a juvenile jail.

The boy was expelled from the school on Oct. 6 after telling police he was tired of bullies picking on him and wanting to "Show them [who is] boss, " including his desire to point a loaded gun at one child he named, according to court charging paperwork. Officers from the Duvall-Carnation Police Department found two shotguns and a 9 mm pistol in a camper where the boy had been staying near his home, according to the charging papers.

The boy's mother told police that her son said he planned to get back at bullies, saying he planned to go to a bus stop and point a gun at two boys he named, then go to school and kill about 20 other students who teased him, the charging papers say. He also said he planned to kill teachers, providing the names of some, before returning home and killing family members, the mother told police.

The mother said she was afraid of what the boy is capable of doing and that she considered his threat to harm or kill his family legitimate. She said she was in the process of placing him in a juvenile facility in Montana, the charging papers said.

The Seattle Times is not naming the boy because he was prosecuted as a juvenile.

King County Deputy prosecutor Jennifer Worley said that the boy pleaded guilty as charged Thursday to:

-- assault and second-degree harassment for strangling and harassing his sister in an incident in September;
-- felony harassment for threatening to kill his family in October;
-- felony harassment for threatening to kill another student in October;
-- harassment for threatening another student in October;
-- custodial assault, for attacking a corrections officer

The boy was given an exceptional sentence of 52 to 65 weeks in a state Juvenile Rehabilitation Administration facility. He will receive credit for the 162 days he has already served at the King County Juvenile Detention Center, Worley said.