From KOMO:

A 13-year-old girl is facing assault charges following a scuffle with a boy in her class.

The girl has been charged with third-degree assault in an incident that took place in the playground of Denny Middle School in June 2009.

The teen, then a sixth-grader, is accused of hitting a 12-year-old boy "twice on the head with her backpack," according to the statement of probable cause.

Several witnesses claimed the girl's bag contained rocks; however, a search of the bag did not reveal any rocks.