Eight people dead after an avalanche hit a group of high school students and teachers climbing in central Japan.

An avalanche killed seven Japanese high school students and an instructor during a mountaineering field trip at a ski resort north of Tokyo, authorities said.

Nearly 50 students and instructors were caught by the Monday morning avalanche in the town of Nasu in Tochigi prefecture, about 190 kilometres from the Japanese capital.

Police confirmed the death of the eight people late on Monday, the prefecture said. Forty other people were injured, including two who were in serious condition, a prefecture report said.

REUTERS Japan self-defence forces soldiers carry victims after an avalanche hit a group of high school students and teachers climbing near a ski resort in Nasu, north of Tokyo.

Japanese media said the students were on the last day of a three-day training programme for members of mountaineering clubs from seven schools in the area. They had earlier reported that all eight fatalities were students.

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REUTERS Rescue workers carry victims after an avalanche hit a group of high school students and teachers climbing near a ski resort in Nasu, north of Tokyo.

Heavy snow had fallen overnight, so a planned climb was cancelled and instead students were practising moving through heavy snow as mountain survival training, public broadcaster NHK said.

One unidentified student told NHK by telephone that there was a strong wind and he could see a white mass heading toward him. An instructor said to get down, and then everyone was engulfed, he said.

Tochigi prefecture said 40 students and eight instructors were on the slope. Fourteen others in the group did not go out. The ski season had ended at the resort.