Entombed in snow: Mother and three children killed in car buried by drifts as bad weather kills eight in Japan Kazuyo Miyashita, 40, her two daughters Misa, 17, and Sayo, 14, and her son Daiki, 11, died at a hospital of carbon-monoxide poisoning The storm caused two-metre-high drifts Heavy snow that fell on the main northern Japanese island of Hokkaid Over the weekend eight people died including the family A mother and her three children have been killed after their car was buried by drifts after a weekend of heavy snow in Japan. At the weekend eight people were killed on Hokkaido island due to the poor weather including the family. Kazuyo Miyashita, 40, her two daughters Misa, 17, and Sayo, 14, and her son Daiki, 11, were trapped in their car during a snow storm. Trapped: Policemen shovel snow around a vehicle of Kazuyo Miyashita. The mother and her three children died at a hospital Saturday night of carbon-monoxide poisoning after the vehicle got buried in the snow Dangerous: Heavy snow that fell on the main northern Japanese island of Hokkaido over the weekend has killed eight people, including the family Despite the best efforts of rescuers, they died at a hospital on Saturday night of carbon-monoxide poisoning, according to Kyodo news service. Separately, Haruna Kitagawa, 23, froze to death after leaving her car, stuck in the snow. A 53-year-old man died Sunday after getting buried in the snow, although his nine-year-old daughter found with him was recovering, Kyodo said. Also over the weekend, a 54-year-old man and a 76-year-old man were found collapsed in the snow in another part of Hokkaido, and both were confirmed dead, it said. The storm caused two-meter-high (six-and-a-half-feet) drifts and was blamed for derailing a bullet train in Akita prefecture, south of Hokkaido, on Saturday afternoon. Kyodo said the passenger train was moving slowly because of the heavy snow on the tracks, and the derailment caused no injuries. Killed: A 53-year-old man died Sunday after getting buried in the snow, although his 9-year-old daughter found with him was recovering, Kyodo said Powerful: A snowdrift in Nakashibetsu town in Japan's northern island of Hokkaido. Eight people died in snow-related accidents in Hokkaido over the weekend Stuck: Stranded vehicles are buried under snow along a road in Nakashibetsu, Hokkaido