Five people were injured, including two with burns, when a fire swept through a condominium complex in Hunterdon County early Sunday morning, officials said. The fire broke out at 3:48 a.m. at the Union Hill Condominium Association on Sam Bonnell Drive in Union Township, according to the Clinton Fire Department. As of late Sunday morning, officials did not know what caused the blaze, said Clinton Fire Chief Jeff Hedden. Three civilians suffered injuries, including two burn victims who were flown to different burn hospitals, and one person who suffered trauma injuries after falling and was tran…