BOSTON -- They may have thought it was just a prank, but two local schools aren't laughing at the hijinks of a girl's soccer team.

The Boston Herald reported that some Holliston High School players decided to urinate on their rivals' soccer field.

Worse, the video of the girls pulling that prank at Medway High showed up online.

School officials said the field has been disinfected and no matches should be disrupted.

Holliston's principal would only say that "appropriate" disciplinary action was taken and refused to discuss the case further.

Any players determined to have been involved in the prank could face suspension from the Massachusetts Interscholastic Athletic Association, officials said.

Medway's superintendant said the photos of the prank that were posted online did not prove beyond doubt that his school's three-year-old synthetic field was urinated on, but he said the field was disinfected anyway as a precaution.

Medway was scheduled to play Holliston next on Sept. 14. The two schools have a long-standing rivalry and in 2002 a former Medway athletic director suffered broken ribs during a basketball game brawl with Holliston.