Five Chinese were presumably killed early Monday after an oil refinery blast rocked a settlement in the Zabaikalsky Kray in eastern Russia, news agencies reported. The executive director of Zabaikalsky Refining Company, Arkady Chuprov, and a total of 18 Chinese were working at the oil refinery in the village of Dauria at around 4:25 a.m. local time (1925 GMT Sunday), when an explosion occurred inside the pumping station.