According to "Shinsengumi Ibun," Masa YAGI, the wife of Gennojo YAGI, saw Taizo HIJIKATA vigilantly keeping a watch throughout the night; she also noted that Soji OKITA and Sanosuke HARADA were undoubtedly at the scene of the assassination, and that Keisuke YAMANAMI was probably there also.
『新選組遺聞』では、八木源之丞の妻八木まさが土方歳三が夜中にしきりに様子をうかがっているのを目撃しており、現場には沖田総司と原田左之助は確かにおり、山南敬助もいたのではないかと記している。