The Bethel Fire Marshal's office has released the results of two recent investigations.  The Oak Ridge Road  home damaged in a blaze last week did not have working smoke alarms.  The fire was started accidentally in a basement bedroom due to “improperly discarded or unattended smoking material.”  The homeowner did not call 911 immediately, which caused the flames to spread, resulting in extensive structural damage and made the home uninhabitable.  The fire that destroyed three school buses last month started accidentally.  The fire marshal determined that most likely cause was an electrical failure in the engine compartment of one of the vehicles.  The investigation is ongoing, but intentional fire cause has been ruled out.  First Student replaced the van immediately.  The two-full size buses were spares.