Prime Minister Yoshihiko Noda has cancelled campaigning in Tokyo ahead of a 16th December election and is on his way back to his office, but there was no immediate plan to hold a special cabinet meeting, according to Reuters.
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Brad Treat, 38, was killed on a trail in the Halfmoon Lakes area of the Flathead National Forest, just outside Glacier National Park.
Appeal judges are to decide on Thursday whether a woman can use the frozen eggs of her dead daughter to give birth to her grandchild.
The £70 million F-35B jet arrived at RAF Fairford in Gloucestershire, two years after engine trouble postponed its first scheduled visit.