The nearly 82,000-acre Detwiler Fire in Mariposa County, which was still smoldering as of the weekend and 98 percent contained, was sparked by a gunshots on public lands, investigators now believe. As NBC Bay Area reports, investigators from the California Department of Forestry and Fire Protection made the announcement Friday about the fire's source, officially "discharge of firearms," and they're now seeking the public's help in finding suspects.

For now, officials said, a $2,000 reward is being offered for information leading to the arrest and conviction of the person(s) responsible, as KRON 4 tells us. Anyone with information should contact Crime Stoppers at 559-498-7867.

The fire began on the afternoon of July 16 and quickly consumed upwards of 15,000 acres in its second day, threatening the small town of Mariposa and leading to a rare, town-wide evacuation. In total the fire destroyed 131 structures, including 63 homes. It went on to burn for over three weeks and will go down as one of the larger fires in this fire season — fingers crossed, the largest.

Previously: Detwiler Fire Grows To 74,000 Acres, Destroys 58 Homes