Students at fire-damaged Kahului Elementary now won't be able to return to class until Monday.
The Department of Education had hoped to reopen the school Thursday, but more work is needed to prepare the campus for kids to come back.
Officials have said the blaze at the school was intentionally set Friday night and caused at least $1.2 million in damage.
At least four classrooms were affected and the fire also affected the school's water lines.
An arson investigation has been opened.
Kahului Elementary serves about 960 students.
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