The cause of a Monroe house fire is under investigation.  Several residents stopped by Monroe Fire headquarters shortly after 6:30pm Tuesday and reported a fire down the street on Moose Hill Road.  Firefighters arrived within a minute and found all occupants safely evacuated.  Flames were coming from the attached garage, with smoke throughout the entire house.  The fire was extinguished before it entered the living area.  Stevenson Volunteer Fire Company, Stepney Fire Department, White Hills Fire Company of Shelton and Huntington Fire provided mutual assistance.  No firefighters were injured during the response.