A classroom at Vartan Gregorian Elementary School on Wickenden Street sustained major damage in a fire Wednesday morning, officials said. Providence fire officials said no civilians or firefighters were hurt in the blaze, which came in at about 9:35 a.m. Five staff members were in the building, but were unharmed, fire officials said. The fire, which is not considered suspicious, took about 45 minutes to get under control, according to fire officials. The sprinkler system was going off in the room when firefighters arrived. The classroom where the fire took place was badly damaged, and other rooms had some smoke and water damage, according to fire officials. School district administrators have told fire officials that the incident shouldn’t affect the start of the school year.