NRA Executive Vice President Wayne Lapierre told a news conference that "violent" video games was one of the reasons behind acts of violence and that a child growing up in the US witnesses "16,000 murders" by the time they reach 18-years-old.
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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.
As many as 10 people have been rescued following the raid, according to a Bangladeshi official.