KANSAS CITY, Mo. — The 22-year-old man suspected of shooting five middle-aged white men since last year — including four on south Kansas City walking trails — threatened in 2014 to shoot up a school and “kill all white people,” according to court records. Fredrick Demond Scott, who was charged Tuesday in two killings and named as a suspect in three more, made those statements in January 2014 at Center Alternative School, as documented in a municipal citation for harassment. Scott, who is black, has been charged with murder in the deaths of Steven Gibbons, 57, and John Palmer, 54. On Tuesday, Jackson County Prosecutor Jean Peters Baker announced those charges, also naming Scott as a suspect in the killings of David Lenox, 67; Timothy S. Rice, 57, of Excelsior Springs; and Mike Darby, 61, co-owner of Coach’s Bar & Grill. All five were white men between ages 54 and 67. All five appeared to have been fatally shot, most from behind, in surprise attacks as they walked dogs, visited park areas and, in one case, walked down a city street.