ST. CHARLES COUNTY • Investigators have ruled out arson as the cause of the fire that destroyed Bogey Hills Country Club's landmark clubhouse last week but have yet to firmly conclude what triggered the blaze.

Assistant Chief Steve Brown of Central County Fire and Rescue said Friday that a final report from the 40-member team of federal, state and local investigators is expected within 30 days. That will detail the investigation's findings on the fire's origin.

He said the on-scene portion is now completed. The team included a 24-person contingent from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives.

Also aiding Central County were the state fire marshal's office and the St. Charles County Police Department.

The announcement that arson was not involved did not come as a surprise. On Monday, Brown had said there had been no indication by then that the fire had been deliberately set.

He said investigators spent nearly a week examining the rubble, conducting interviews and reviewing hours of video footage shot by firefighters and onlookers.