According to JR East, the JR Sobu Line was suspended between Mitaka Station and Nakano Station due to a personal injury that occurred at Koenji Station in Suginami-ku, Tokyo, and the need to check the points for switching lines at Mitaka Station. The stop at each station is that the operation resumed before 4 pm.
In addition, the JR Chuo Line express train, which had been suspended between Tokyo Station and Kunitachi Station, resumed operation at around 4:15 pm.