WEED, Calif. — Roseburg Forest Products Co. said Wednesday that it is investigating whether a fire that killed two people as it swept through a Northern California town was caused by the possible failure of a water-spraying machine used to cool ash at its veneer mill. They also announced that although the investigation was not complete, it was planning to provide up to $50 million for a community restoration fund. The Mill Fire erupted Sept. 2 at the company’s facility in the small town of Weed on Interstate 5, about 280 miles northeast of San Francisco. Roseburg Forest Products said…they produce electricity in a co-generation facility fueled by wood remnants, and the ash that is ejected is sprayed with cooling water by a “third-party-supplied machine.” “Roseburg is investigating whether the third-party machine failed to cool the ash sufficiently which thereby ignited the fire,” the release said. Hundreds of people fled as the fire spread, destroying 107 structures.