Japan's PM Yoshihiko Noda in leadership contest
Japan's prime minister is set to face a leadership challenge, just over a year after taking office.
Yoshihiko Noda won his won the role as the head of the Democratic Party of Japan when Naoto Kan resigned - partly because of his handling of the Fukushima nuclear crisis.
The new contest is a requirement under the party's rules, with three men challenging for the top job. The party's main opposition, the Liberal Democratic Party, is due to choose its new leader next week.
Marika Oi reports.