In Ashley v. Dilworth, 147 F.3d 715 (8th Cir.1998), the prisoner alleged that prison officials repeatedly placed him in proximity to inmates on his enemy alert list and that he was twice attacked, once with a sharpened, nine-inch screwdriver and once with a butcher knife, and the court ruled that he had alleged imminent danger of serious physical harm. 147 F.3d at 717.