Asia

Extensive blackout in Tokyo, affecting trains, govt offices

  • A station attendant, left, responds to passengers at a station in Tokyo after train services are suspended Wednesday, Oct. 12, 2016. An extensive blackout struck Tokyo on Wednesday, affecting government offices and halting trains in the Japanese capital just before the evening rush hour. (Akiko Matsushita/Kyodo News via AP)

    A station attendant, left, responds to passengers at a station in Tokyo after train services are suspended Wednesday, Oct. 12, 2016. An extensive blackout struck Tokyo on Wednesday, affecting government offices and halting trains in the Japanese capital just before the evening rush hour. (Akiko Matsushita/Kyodo News via AP)  (The Associated Press)

  • Firefighters gather around black smoke billowing from an unmanned power substation in Niiza, Saitama prefecture, near Tokyo, Wednesday, Oct. 12, 2016. An extensive blackout struck Tokyo on Wednesday, affecting government offices and halting trains in the Japanese capital just before the evening rush hour. Tokyo Electric Power Co., a utility serving the Tokyo region, said officials are investigating the cause of the blackout. (Kyodo News via AP)

    Firefighters gather around black smoke billowing from an unmanned power substation in Niiza, Saitama prefecture, near Tokyo, Wednesday, Oct. 12, 2016. An extensive blackout struck Tokyo on Wednesday, affecting government offices and halting trains in the Japanese capital just before the evening rush hour. Tokyo Electric Power Co., a utility serving the Tokyo region, said officials are investigating the cause of the blackout. (Kyodo News via AP)  (The Associated Press)

  • Passengers wait for a train at a station in Tokyo's Shinjuku district after train services are suspended Wednesday, Oct. 12, 2016. An extensive blackout struck Tokyo on Wednesday, affecting government offices and halting trains in the Japanese capital just before the evening rush hour. (Akiko Matsushita/Kyodo News via AP)

    Passengers wait for a train at a station in Tokyo's Shinjuku district after train services are suspended Wednesday, Oct. 12, 2016. An extensive blackout struck Tokyo on Wednesday, affecting government offices and halting trains in the Japanese capital just before the evening rush hour. (Akiko Matsushita/Kyodo News via AP)  (The Associated Press)

An extensive blackout has struck Tokyo, affecting some government offices and halting trains in the Japanese capital.

Tokyo Electric Power Co., a utility serving the Tokyo region, said officials are investigating the cause of Wednesday's blackout that broke out in the afternoon.

The company, known as TEPCO, said smoke was detected at its power substation in Niiza city, near Tokyo, and officials are looking into the cause of the incident and whether it's related to the blackouts.

Footage on Japanese television showed black smoke billowing into the sky at the substation in a business district. There were no immediate reports of injuries from the incident.

TEPCO said as many as 350,000 households and offices were temporarily out of power. Electricity was restored to most of them later.