STOCKTON -- The mother of a Stockton elementary school student is under arrest for allegedly assaulting her child's principal over a dress code violation.

Police say Pami Gibbs also is accused of making references to ethnicity during the attack on Fillmore Elementary Principal Evangelina Ramos. Gibbs is white, and Ramos is a Latina.

Assistant Superintendent Dan Wright told The Record of Stockton (http://bit.ly/qFvpQ5) that Gibbs became upset Monday morning when Ramos said the 29-year-old woman's son couldn't wear a T-shirt with skulls on it. According to witnesses, Gibbs suddenly began punching Ramos in the face.

Stockton Unified Police Chief Jim West says Gibbs left school grounds and was arrested at her home two hours later.

Gibbs was booked on two felony charges of battery and criminal threats and three misdemeanors, including hate crime.