Tokyo metropolitan police are investigating at least six suspicious fires that occurred on JR East lines in Tokyo's Shinagawa, Kita and Nakano wards between Aug 16 and Aug 27.
Police believe a serial arsonist could be responsible for all of these fires which gave caused disruptions to train services, Fuji TV reported Sunday.
According to police, the first fire occurred at around 10 a.m. on Aug 16 by a fence near the Shinagawa electric power substation of JR East. Traces of a burnt newspaper and cotton work gloves were found.
On Aug 23, a burnt plastic water bottle and burnt tissue paper were found near the same substation after another fire. Police said surveillance camera footage showed a suspicious man wearing a cap in the area just before that fire occurred.
In the most recent case, on Aug 27, a power transmission cable was set on fire at two points on the Yamanote line near Ebisu Station, Fuji reported.© Japan Today