SUPERIOR — Could an underground coal fire be what sparked the state’s most destructive fire? That’s a question authorities are asking as they investigate several potential sources of the Marshall Fire. Related Articles AG warns against real estate price gouging in wake of Marshall Fire Saving animals is his life’s work. He wished he could have done more during Marshall fire. Marshall fire, omicron prompt a special health insurance enrollment period in Colorado Bone fragments recovered at property where 91-year-old woman last seen during Marshall fire U.S.