Police in Northern Ireland last night confirmed that they had arrested a juvenile in connection with an arson attack on a Co Down school.
The youth was questioned about the incident, which damaged two classrooms and a store at the De La Salle High School in Downpatrick, before being released this morning.
Two more teenagers were arrested today.
A sum of money was taken from the premises and students' exam work was also destroyed.
"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.
PA