Grand Rapids, MN)  --  Fire officials are calling in air and ground reinforcements as wildfires continue spreading across northern Minnesota.  Mark Christensen with the Interagency Fire Center says the fires are getting bigger than normal and we're having over 20 fires reported each day.  The fire fighting lineup now includes crews from Illinois and Michigan and water-dropping aircraft from Nevada.  More than 700 fires have ignited in central and northern Minnesota in one of the earlier wildfire seasons in memory.