Hokkaido Electric Power Co official Yoshihiro Akiyama said it was unclear when power could be restored to the blacked out homes, mostly in and around Kushiro. A fire broke out at an oil tank in the city of Tomakomai, but no workers were reported injured, said Hokkaido prefectural police official Kuniyoshi Omori. Black plumes of smoke and flames leapt from the tank, which police said belonged to Idemitsu Co The fire was contained within three hours. Nuclear power facilities on Hokkaido were inspected after the quake, but officials said there was no evidence of any damage or safety breaches. Omori said one person was injured when a local train carrying about 39 passengers derailed.