Five people sustained minor injuries in a fire and small explosion at the treatment plant in Quincy, MA, officials said.
The fire burned several stories down inside a sewage treatment plant, and reignited around 6 p.m., about five hours after it first began.
The five workers sustained the injuries in the initial fire, officials said.
The fire started from a piece of equipment exploding about seven or eight stories below the ground, state police said. Smoke poured out of the building for hours Monday afternoon, and began to rise again just before 6 p.m.
“It’s an air scrubber that’s on fire. So we’re looking mostly at insulation that’s in it. So it’s a contained area,” Quincy Fire Chief Joseph Barron said.
No one knows the cause of the blast, but the Massachusetts Water Resources Authority (MWRA) said one worker said it may have started with a fan they started while doing routine maintenance on an odor control system.
“We can’t get in to see if it’s isolated to one area or more expansive,” Barron said. “We don’t know.”
The MWRA said the five employees transported to hospital had difficulty breathing and eye irritation.