A threat of a shooting made Wednesday for Larkin High School in Elgin on Thursday was a “prank,” but police are nonetheless providing extra security at the school.

“The rumors have been thoroughly investigated, the individuals involved have been identified, and it has been determined that this was done as a prank,” police said in a Facebook posting. “There is no reason to believe there is any validity to these rumors.”

But the police said they and School District U-46 are “taking extra steps and will have extra security to ensure the safety of the students and the staff at Larkin High School.”