MUKILTEO — It’s back to school Monday for all students at Endeavour Elementary School.

An early morning fire Dec. 4 closed the Mukilteo school, with learning shifted to remote Zoom classes. About 450 students attend the school on Harbour Pointe Boulevard. Each was given a laptop to use at home. Community agencies pitched in with meal distribution and child care.

“Our teachers and staff are in the process of moving back in, to make sure their rooms and areas ready to roll,” Mukilteo School District spokesperson Diane Bradford said as the school prepared to reopen.

The confirmation that in-person classes could resume was made Friday.

“We don’t know yet the cause of the fire,” Bradford said.

Mukilteo Fire Chief Glen Albright said firefighters were dispatched to a fire alarm around 1:30 a.m. Dec. 4. The overnight fire tore through one section of the school and took 43 firefighters over three hours to extinguish. Other areas sustained smoke and water damage.

“The fire burned through some of the trusses and we had to cut multiple holes in the metal roof to make access to the fire,” he said. “There was active fire up until about 3:47 a.m.”

Though the building is open, restoration work will continue in the coming weeks. Some areas of the school do not yet have replacement carpet. Other parts are still under construction, but have been shielded with plywood walls to keep a physical boundary between workers and students for safety.

“Mold is not a concern because the restoration company addressed that with special equipment that kills mold spores as it removes moisture from the air,” Superintendent Alison Brynelson wrote in a message to families. “They also removed items from affected parts of the school, ensured the items were dry, cleaned each item, and returned them to the school.”

Andrea Brown: 425-339-3443; abrown@heraldnet.com; Twitter: @reporterbrown.