Federal investigators are offering added incentives to the public in the search for the person(s) responsible for starting a wildfire that killed one and destroyed scores of homes near Chelan Falls last month. On Monday, the Bureau of Alcohol, Tobacco, Firearms & Explosives (ATF) announced it is offering a $5,000 reward for information leading to the apprehension and prosecution of anyone responsible for igniting the Chelan Hills Fire. The blaze sparked on the night of July 4 in Western Douglas County, where it quickly spread in gusty winds, torching over 10,000 acres and destroying over 100 structures. Douglas County Sheriff Tyler Caille says although those accounts were also made directly to his agency by at least one person, it's still not exactly clear how the fire began. ATF's contribution now brings the total reward money being offered to $30,000 when added to the $25,000 that was already being accorded by Douglas County.