Fire destroyed a number of rooms after an arson attack on a Co Down school overnight.
Police said two classrooms and a store at the De La Salle High School in Downpatrick were extensively damaged.
A sum of money was also taken from the premises.
Other classrooms were also smoke-damaged in the attack.
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"A considerable amount of the students' own GCSE coursework in preparation for exams was also destroyed in the fire," a police spokesman said.
Fire officers said up to three separate blazes were started deliberately using mounds of children's books and artwork.
Witnesses reported seeing a number of males acting suspiciously around the school at 6.30pm. Anybody with information is asked to contact police.