The principal of Ward Melville High School in East Setauket alerted parents Friday to a possible "inappropriate scavenger hunt" this weekend and warned that any students caught participating will be disciplined.
In an email distributed to parents, Principal Alan Baum said no "scavenger hunt" has been sanctioned by the school.
"Secondly, the information we received about this scavenger hunt is quite disturbing," he wrote. "In fact, it is disgusting and parts of it are illegal. In no way do we condone any aspect of this scavenger hunt."
Suffolk police said patrols will be on the lookout.
Baum said students caught participating on or off campus would face discipline. He also urged parents to have a conversation with their children about the matter.
Baum could not be reached for comment Friday.
The high school's homecoming festivities are Saturday, starting with a carnival at noon, football game at 2 p.m. and dance from 7 to 10 p.m. A community pep rally scheduled Friday night was canceled due to inclement weather.