Three adults were also injured, with one of them showing no vital signs, after the incident in Kawasaki city, south of Tokyo, a city official told Reuters. NHK said a suspect detained at the scene died later.
The girls, aged around 6 to 7, were students at a private Catholic school and were waiting for their school bus, NHK said. The broadcaster said a man detained at the scene also died.
(Production: Masashi Kato, Pedja Stanisic Akiko Okamoto)