Classes were canceled Monday at a Mukilteo school after an arson damaged buildings and shut down the school's phones and internet service. The fire was reported late Saturday night at Columbia Elementary School on Harbor Pointe Boulevard. Investigators say someone set two portable toilets on fire. The flames spread to the exterior of the building and traveled up into the eaves, ruining computer and electrical equipment. That sent heavy smoke into the school's kitchen and gym area. "We just had our family fun night here on Friday night," said parent Randi Seaberg. "We had hundreds of families come and just celebrate the end of the school year, so to have something like this occur right after a really nice event is even more upsetting."