SIOUX FALLS, S.D. (KELO AM) - A stabbing victim is being uncooperative with Sioux Falls police about how he received his wounds last night in a fight at a house on South Spring Avenue.     Officer Sam Clemens says the suspect, 20-year-old Mohamed Daud Abdikadir, came to the Law Enforcement Center to tell police he was in a fight in his home.     Clemens says the 17-year-old victim suffered a knife wound to the back of his head and he was taken to the hospital by his girlfrien.     Officers went to the house and found evidence of a fight and marijuana and paraphernalia.     Clemens says Abdikadir is charged with aggravated assault and possession of marijuana.     Police have not determined the cause of the fight.