Pasadena High School was vandalized Sunday night in anticipation of the Turkey Tussle against rival John Muir.

School officials said parts of the school’s field, including a depiction of the school’s bulldog mascot, were painted blue, which are John Muir’s colors.

Obscenities were spray painted in parts of the field as well as the word “Muir.”

Police are investigating the vandalism, but don’t know whether the culprits are Muir students or possibly just a couple of the school’s football fans.

The two high schools meet Friday at the Rose Bowl.

Officials said that vandalism happens most years, but were hoping to avoid it this year since the high school put in a new field.