The 3-alarm fire broke out in the Upper School auditorium on April 17th.
Two firefighters were injured in the blaze, which caused an estimated $1 million worth of damage at the school.
Arson investigators have now turned their focus on finding the person or persons responsible for setting the fire.
Anyone with information concerning this fire is encouraged to call Crime Stoppers at (800) TIP-3333 or the State Fire Marshal's New Castle Division at (302) 323-5375.
