One person was seriously injured and others sustained minor injuries after a four-car pileup on Ga. 400 in Dawson County Tuesday morning. Dawson County Emergency Services responded to a call at approximately 4:30 a.m. that a wreck had occurred between the outlet mall entrance and the Dunkin Donuts. According to Sheriff Jeff Johnson, the wreck occurred when one driver was traveling northbound on Ga. 400 in the southbound lanes.