The fire was officially caused by construction work, but it has not been determined who caused the fire at this time. Until it is official people can not going around saying it was caused by the demolition contractor, Trepus Corporation.

I have changed the title of this thread to reflect that and I have also linked back to the original story:

Just like with anything is this business, it's a rumor until it gets proven as a fact.

Local News | Sparks from metal cutting started Everett tech school fire | Seattle Times Newspaper