The first images of the Air Algerie plane crash site in Mali show twisted metal and door panels lying in the sand.
French officials have said that they believed poor weather was the most likely cause of the crash in which 116 people died.
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The PM promises to double to 200,000 the number of homes built under an existing scheme aimed at easing Britain's housing shortage.
The Met Office has weather warnings in place for snow and ice until 10am in the north and west.
The plan, which would effectively strip banks of the benefit of recent corporation tax cuts, forms part of the party's election manifesto.