Japanese Prime Minister Naoto Kan, who has been facing problems since the time of tsunami and earthquake in Japan, is at risk of losing a no-confidence vote in parliament later on Thursday, and will resign in the autumn, a private broadcaster TBS said.

Earlier in the day, the head of a tiny ruling coalition partner, the People's New Party, had urged the unpopular premier to resign once he has extended the current parliament session and dealt with Japan's earthquake-triggered crisis, including radiation leaks at crippled Fukushima nuclear plant.