The fire at the Savannah River National Laboratory prompted officials to limit air traffic in the area. One person was hospitalized with minor injuries, officials said.
The police said on Saturday that the structure, a tourist attraction for decades, was probably not salvageable. A man was arrested in connection with the blaze.
Prime Minister Mark Carney said the “violent, fast-moving” fire on Saturday in Alberta was one of the worst tragedies for Canada’s armed forces in peacetime on Canadian soil.