Police said Friday they are investigating cases of train sabotage, adding that there have been seven cases of what appears to be intentional disruptions of train services on four Seibu Railway Co. lines in western Tokyo since the beginning of September.Police suspect the disruptions were caused by the same party.The trains were apparently stopped as a result of someone pushing emergency buttons at unattended grade crossings or after alarm system wires had been cut, police said. The incidents occurred within a 2-km area of Higashi-Murayama on the Seibu Shinjuku, Tamako, Kokubunji and Seibu-En lines.The first case occurred Sept. 3 on the Tamako Line after an emergency button at a grade crossing was pushed, forcing one train to stop for four minutes. Police suspect whoever pushed the button was aware of how the signals work.

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