Authorities say a 12-year-old boy has been arrested after throwing a knife at a 9-year-old boy when they got into an argument while playing video games at a Wichita home.The Wichita Eagle reports that the 9-year-old and his 13-year-old brother were in the home of the 12-year-old when the argument erupted Saturday night. Police say the younger boy was taken to a hospital with a minor cut to his back. Neither of the older boys was hurt.Police say the 12-year-old was arrested early Sunday on suspicion of aggravated battery and aggravated assault.Police say the investigation is ongoing.