Garden Grove Fire Department arson and police investigators are now trying to determine if a crime was committed.
The fire broke out on Sunday at around 1:15 p.m. The blaze was contained to two classrooms and was knocked down at 2:14 p.m. Another six classrooms were damaged by smoke and water.
School officials were trying to assess the damage. One of the damaged classrooms was being used by a teacher whose lessons included Vietnamese American history. The campus is used by a Vietnamese school on Sundays, but no one was inside.
School resumed Monday and classes that use the damaged classrooms were moved to the gym, library and other school buildings.