Stockton, Calif. ? A rock was thrown through the front window at the home of Pete Morelli, an NFL referee who made an incorrect call in last Sunday’s playoff game between the Pittsburgh Steelers and Indianapolis Colts. Morelli also is a high school principal, and police said Friday it was unclear whether the incident was related to his school job or his role as a referee.

Morelli, who has been an NFL official for nine years, overturned on replay an interception by Pittsburgh’s Troy Polamalu. The league said Monday that Morelli should have let the call on the field stand.