The incident was determined to have been an accident and no criminal charges will be filed, according to Lt. J. Paul Vance, state police public information officer. The investigation was conducted by the New Milford fire marshal's office, the New Milford Police Department, the state fire marshal's office and the state police's fire and explosion investigation unit. The investigation into the explosion determined the gas leak was caused by an open, abandoned liquid propane gas line that had not been properly capped some nine years earlier when an gas dryer had been removed