A Danbury Police Officer out on patrol Saturday afternoon spotted a fire on a second floor porch and went into action.  Officer Emilio Masella called the Fire Department and then used the fire extinguisher from his patrol car to slow the flames on Rose Hill Avenue.  Other Police Officers were able to alert the residents of the blaze.  Within minutes of getting the call, firefighters finished extinguishing the fire, and removed the occupants from the building. The Fire Marshals Office is investigating cause and origin of the fire.  No injuries were reported.