Anchorage Fire Department responded to a report of flames coming from a duplex near the intersection of 78th and Cranberry just before 01:30 am. The deck and front of the single story duplex were engulfed in flames when the first engine arrived on location. After initial reports of possible occupants inside, both units in the structure were searched and determined to be all clear and the incident commander declared the fire under control in approximately 30 minutes. The fire appears to have started on the front deck area of the residence, but the cause is still under investigation. Serious damage to the front of the building resulted, but damage estimates were not available.