Two civilians and one firefighter were injured in a house fire Friday in Bethel.  Stony Hill and Bethel Firefighters were dispatched to a home on Oak Ridge Road near the intersection with Walnut Hill Road.  They found heavy smoke from the front door and windows. Brookfield Volunteer Fire Company and Danbury Fire Department responded with mutual aid.  Crews were faced with deteriorating conditions which ultimately lead to a floor collapse in the front living room.  The building was evacuated and a defensive attack was initiated.  The fire was brought under control in about an hour. Crews remained on scene hitting hot spots and overhauling the badly damaged house. Hawleyville Volunteer Fire Company was then called in as well.  The civilians and firefighter were transported to Danbury Hospital with non-life threatening injuries. The cause of the fire remains under investigation by the Bethel Fire Marshal office.