A homecoming prank caused thousands of dollars in property damage.
It happened at Riverside Brookfield High School on Wednesday.
Officials say they believe students spray painted obscenities on the building, left furniture and trash on the lawn, and hung up offensive pictures of staff.
Some live chickens were also left there.
All of this caused up to $3500 in damage.
The school is calling this vandalism, but it did not say if it knew which students were responsible.