The Duke of Edinburgh has started his official duties in Toronto, Canada by meeting members of the Royal Canadian Regiment.
2013 is the 60th anniversary of his role as the regiment's colonel-in-chief.
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Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.
Between eight and 10 people have been rescued following the raid, according to Bangladeshi police.